Selina Textbook Solutions: Circulatory System | Biology Class 8 ICSE PDF Download

 Page 1


The Circulatory System 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements: 
(a) The only artery which carries deoxygenated blood is called, 
1. Hepatic artery 
2. Pulmonary artery 
3. Aorta 
4. Renal artery 
(b) Pulmonary vein carries 
1. Oxygenated blood 
2. Deoxygenated blood 
3. Glucose-deficient blood 
4. CO2 laden blood 
(c) Function of WBCs is to 
1. Transport oxygen 
2. Help in clotting of blood 
3. Provide immunity 
4. Provide storage of food. 
(d) Blood Capillary is a 
1. Broad tube 
2. Artery with thick wall 
3. Vein with large lumen 
4. Narrow tube made up of endothelium only. 
(e) Nucleus is absent in  
1. RBCs 
2. WBCs 
3. All blood cells 
4. Liver cells. 
Page 2


The Circulatory System 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements: 
(a) The only artery which carries deoxygenated blood is called, 
1. Hepatic artery 
2. Pulmonary artery 
3. Aorta 
4. Renal artery 
(b) Pulmonary vein carries 
1. Oxygenated blood 
2. Deoxygenated blood 
3. Glucose-deficient blood 
4. CO2 laden blood 
(c) Function of WBCs is to 
1. Transport oxygen 
2. Help in clotting of blood 
3. Provide immunity 
4. Provide storage of food. 
(d) Blood Capillary is a 
1. Broad tube 
2. Artery with thick wall 
3. Vein with large lumen 
4. Narrow tube made up of endothelium only. 
(e) Nucleus is absent in  
1. RBCs 
2. WBCs 
3. All blood cells 
4. Liver cells. 
(f) Sphygmomanometer measures 
1. Pulse rate 
2. Heart beat 
3. Blood pressure 
4. Brain activity 
(g) The blood tastes saltish due to the presence of dissolved: 
1. Sodium chloride 
2. Potassium chloride 
3. Ammonium nitrate 
4. Sodium nitrate 
Short Answer Questions: 
Question 1. 
1. Differentiate between the following pair of terms: 
(a) Pulmonary artery and pulmonary vein. 
(b) Vena cava and aorta. 
(c) Platelets and WBC. 
(d) RBC and WBC Ans. 
Answer: 
(a) Pulmonary artery and pulmonary vein. 
 
(b) Vena cava and Aorta 
Vena Cava Aorta 
1. Vena Cava is a large vein. 1. Aorta is the large artery. 
2. It carries deoxygenated blood from the upper and lower 
parts of the body i.e. head and shoulders. 
2. It carries oxygenated blood to all parts of the body 
through its branches. 
 
 
 
 
 
Pulmonary artery Pulmonary vein 
1. This involves circulation of blood from the heart to the 
lungs. 
1. This involves circulation of blood to the heart from the 
lungs. 
2. It carries deoxygenated blood. 2. It carries oxygenated blood. 
Page 3


The Circulatory System 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements: 
(a) The only artery which carries deoxygenated blood is called, 
1. Hepatic artery 
2. Pulmonary artery 
3. Aorta 
4. Renal artery 
(b) Pulmonary vein carries 
1. Oxygenated blood 
2. Deoxygenated blood 
3. Glucose-deficient blood 
4. CO2 laden blood 
(c) Function of WBCs is to 
1. Transport oxygen 
2. Help in clotting of blood 
3. Provide immunity 
4. Provide storage of food. 
(d) Blood Capillary is a 
1. Broad tube 
2. Artery with thick wall 
3. Vein with large lumen 
4. Narrow tube made up of endothelium only. 
(e) Nucleus is absent in  
1. RBCs 
2. WBCs 
3. All blood cells 
4. Liver cells. 
(f) Sphygmomanometer measures 
1. Pulse rate 
2. Heart beat 
3. Blood pressure 
4. Brain activity 
(g) The blood tastes saltish due to the presence of dissolved: 
1. Sodium chloride 
2. Potassium chloride 
3. Ammonium nitrate 
4. Sodium nitrate 
Short Answer Questions: 
Question 1. 
1. Differentiate between the following pair of terms: 
(a) Pulmonary artery and pulmonary vein. 
(b) Vena cava and aorta. 
(c) Platelets and WBC. 
(d) RBC and WBC Ans. 
Answer: 
(a) Pulmonary artery and pulmonary vein. 
 
(b) Vena cava and Aorta 
Vena Cava Aorta 
1. Vena Cava is a large vein. 1. Aorta is the large artery. 
2. It carries deoxygenated blood from the upper and lower 
parts of the body i.e. head and shoulders. 
2. It carries oxygenated blood to all parts of the body 
through its branches. 
 
 
 
 
 
Pulmonary artery Pulmonary vein 
1. This involves circulation of blood from the heart to the 
lungs. 
1. This involves circulation of blood to the heart from the 
lungs. 
2. It carries deoxygenated blood. 2. It carries oxygenated blood. 
(c) Blood platelets and blood group. 
Platelets WBC 
1. These are colourless, oval or round, cytoplasmic 
fragments 
1. WBC are colourless and lack haemoglobin, larger in 
quantity, and have distinct oval and lobed nucleus. 
2. These play a major role in blood clotting. 2. They prevent body from disease causing germs by 
providing immunity 
3. Their life span is 3-5 days and it is called thrombocytes. 3. Their life span is short i.e. 5 to 20 days. 
 
(d) RBC and WBC 
RBC WBC 
1. They do not have nucleus at maturity. 1. They have a large characteristic nucleus. 
2. They possess haemoglobin and are red. 2. They are colourless as they have no pigment. 
3. They help in transport of respiratory gases. 3. They help in defence mechanism. 
 
Question 2. 
Give any three differences between an artery and a vein: 
Answer: 
Following are the differences between the artery and a vein: 
Artery Vein 
1. Arteries carry blood from the heart to various body parts. 1. Veins carry blood from different body parts to the heart. 
2. These carry oxygenated blood (except the pulmonary 
artery). 
2. These carry deoxygenated blood (except the pulmonary 
vein). 
3. B lood flows with h igh speed and under high pressure. 3. Blood flows with low speed and under low pressure. 
 
Question 3. 
Fill in the blanks with suitable words given below: 
Answer: 
a. The two lower chambers of the heart are called ventricles. 
b. The pulmonary artery takes the blood from the ventricles to the lungs. 
c. The blood loaded with carbon dioxide from the body comes into the right auricle of 
the heart. 
d. The oxygen-rich blood from the lungs comes into the left ventricle of the heart. 
e. The oxygen-rich blood is pumped into different parts of the body through aorta. 
f. The carbon dioxide loaded blood from right ventricle is pumped into the lungs 
through pulmonary artery. 
g. The instrument used to find out the blood pressure is known 
as sphygmomanometer. 
h. The colour of a red blood cell is due to haemoglobin. 
i. The blood plasma contains a dissolved substance called fibrinogen. 
j. The liquid part of coagulated blood is known as serum. 
Page 4


The Circulatory System 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements: 
(a) The only artery which carries deoxygenated blood is called, 
1. Hepatic artery 
2. Pulmonary artery 
3. Aorta 
4. Renal artery 
(b) Pulmonary vein carries 
1. Oxygenated blood 
2. Deoxygenated blood 
3. Glucose-deficient blood 
4. CO2 laden blood 
(c) Function of WBCs is to 
1. Transport oxygen 
2. Help in clotting of blood 
3. Provide immunity 
4. Provide storage of food. 
(d) Blood Capillary is a 
1. Broad tube 
2. Artery with thick wall 
3. Vein with large lumen 
4. Narrow tube made up of endothelium only. 
(e) Nucleus is absent in  
1. RBCs 
2. WBCs 
3. All blood cells 
4. Liver cells. 
(f) Sphygmomanometer measures 
1. Pulse rate 
2. Heart beat 
3. Blood pressure 
4. Brain activity 
(g) The blood tastes saltish due to the presence of dissolved: 
1. Sodium chloride 
2. Potassium chloride 
3. Ammonium nitrate 
4. Sodium nitrate 
Short Answer Questions: 
Question 1. 
1. Differentiate between the following pair of terms: 
(a) Pulmonary artery and pulmonary vein. 
(b) Vena cava and aorta. 
(c) Platelets and WBC. 
(d) RBC and WBC Ans. 
Answer: 
(a) Pulmonary artery and pulmonary vein. 
 
(b) Vena cava and Aorta 
Vena Cava Aorta 
1. Vena Cava is a large vein. 1. Aorta is the large artery. 
2. It carries deoxygenated blood from the upper and lower 
parts of the body i.e. head and shoulders. 
2. It carries oxygenated blood to all parts of the body 
through its branches. 
 
 
 
 
 
Pulmonary artery Pulmonary vein 
1. This involves circulation of blood from the heart to the 
lungs. 
1. This involves circulation of blood to the heart from the 
lungs. 
2. It carries deoxygenated blood. 2. It carries oxygenated blood. 
(c) Blood platelets and blood group. 
Platelets WBC 
1. These are colourless, oval or round, cytoplasmic 
fragments 
1. WBC are colourless and lack haemoglobin, larger in 
quantity, and have distinct oval and lobed nucleus. 
2. These play a major role in blood clotting. 2. They prevent body from disease causing germs by 
providing immunity 
3. Their life span is 3-5 days and it is called thrombocytes. 3. Their life span is short i.e. 5 to 20 days. 
 
(d) RBC and WBC 
RBC WBC 
1. They do not have nucleus at maturity. 1. They have a large characteristic nucleus. 
2. They possess haemoglobin and are red. 2. They are colourless as they have no pigment. 
3. They help in transport of respiratory gases. 3. They help in defence mechanism. 
 
Question 2. 
Give any three differences between an artery and a vein: 
Answer: 
Following are the differences between the artery and a vein: 
Artery Vein 
1. Arteries carry blood from the heart to various body parts. 1. Veins carry blood from different body parts to the heart. 
2. These carry oxygenated blood (except the pulmonary 
artery). 
2. These carry deoxygenated blood (except the pulmonary 
vein). 
3. B lood flows with h igh speed and under high pressure. 3. Blood flows with low speed and under low pressure. 
 
Question 3. 
Fill in the blanks with suitable words given below: 
Answer: 
a. The two lower chambers of the heart are called ventricles. 
b. The pulmonary artery takes the blood from the ventricles to the lungs. 
c. The blood loaded with carbon dioxide from the body comes into the right auricle of 
the heart. 
d. The oxygen-rich blood from the lungs comes into the left ventricle of the heart. 
e. The oxygen-rich blood is pumped into different parts of the body through aorta. 
f. The carbon dioxide loaded blood from right ventricle is pumped into the lungs 
through pulmonary artery. 
g. The instrument used to find out the blood pressure is known 
as sphygmomanometer. 
h. The colour of a red blood cell is due to haemoglobin. 
i. The blood plasma contains a dissolved substance called fibrinogen. 
j. The liquid part of coagulated blood is known as serum. 
Question 4. 
In which organ of our body does blood get oxygenated? 
Answer: 
Blood becomes oxygenated in the lungs. The oxygenated blood is returned to left 
verticles by the pulmonary vein. 
Question 5. 
Which side of the heart (left or right) contains oxygenated blood? 
Answer: 
The left side of the heart contains oxygenated blood. 
Question 6. 
What is the role of haemoglobin in the blood ? 
Answer: 
The haemoglobin is the respiratory pigment which is formed of the iron containing part 
known as haemin and protein part known as globin. It helps to transport respiratory 
gases (oxygen). 
Question 7. 
Name the disease in which the number of platelets reduces to 25,000 – 30,000 per 
cubic mm of blood. State its major symptoms. 
Answer: 
Dengue fever is one such disease in which the number of platelets get reduced to as 
low as 25-30 thousands per cubic mm of blood. The major symptoms of dengue are 
high fever, rashes or red spots on body, nausea or vomiting, pain in abdomen, back, or 
back of the eyes and muscles. 
Long Answer Questions: 
Question 1. 
Given alongside is a diagram of human heart showing its internal structures. Label the 
parts marked 1 to 6, and answer the following questions. 
 
Page 5


The Circulatory System 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements: 
(a) The only artery which carries deoxygenated blood is called, 
1. Hepatic artery 
2. Pulmonary artery 
3. Aorta 
4. Renal artery 
(b) Pulmonary vein carries 
1. Oxygenated blood 
2. Deoxygenated blood 
3. Glucose-deficient blood 
4. CO2 laden blood 
(c) Function of WBCs is to 
1. Transport oxygen 
2. Help in clotting of blood 
3. Provide immunity 
4. Provide storage of food. 
(d) Blood Capillary is a 
1. Broad tube 
2. Artery with thick wall 
3. Vein with large lumen 
4. Narrow tube made up of endothelium only. 
(e) Nucleus is absent in  
1. RBCs 
2. WBCs 
3. All blood cells 
4. Liver cells. 
(f) Sphygmomanometer measures 
1. Pulse rate 
2. Heart beat 
3. Blood pressure 
4. Brain activity 
(g) The blood tastes saltish due to the presence of dissolved: 
1. Sodium chloride 
2. Potassium chloride 
3. Ammonium nitrate 
4. Sodium nitrate 
Short Answer Questions: 
Question 1. 
1. Differentiate between the following pair of terms: 
(a) Pulmonary artery and pulmonary vein. 
(b) Vena cava and aorta. 
(c) Platelets and WBC. 
(d) RBC and WBC Ans. 
Answer: 
(a) Pulmonary artery and pulmonary vein. 
 
(b) Vena cava and Aorta 
Vena Cava Aorta 
1. Vena Cava is a large vein. 1. Aorta is the large artery. 
2. It carries deoxygenated blood from the upper and lower 
parts of the body i.e. head and shoulders. 
2. It carries oxygenated blood to all parts of the body 
through its branches. 
 
 
 
 
 
Pulmonary artery Pulmonary vein 
1. This involves circulation of blood from the heart to the 
lungs. 
1. This involves circulation of blood to the heart from the 
lungs. 
2. It carries deoxygenated blood. 2. It carries oxygenated blood. 
(c) Blood platelets and blood group. 
Platelets WBC 
1. These are colourless, oval or round, cytoplasmic 
fragments 
1. WBC are colourless and lack haemoglobin, larger in 
quantity, and have distinct oval and lobed nucleus. 
2. These play a major role in blood clotting. 2. They prevent body from disease causing germs by 
providing immunity 
3. Their life span is 3-5 days and it is called thrombocytes. 3. Their life span is short i.e. 5 to 20 days. 
 
(d) RBC and WBC 
RBC WBC 
1. They do not have nucleus at maturity. 1. They have a large characteristic nucleus. 
2. They possess haemoglobin and are red. 2. They are colourless as they have no pigment. 
3. They help in transport of respiratory gases. 3. They help in defence mechanism. 
 
Question 2. 
Give any three differences between an artery and a vein: 
Answer: 
Following are the differences between the artery and a vein: 
Artery Vein 
1. Arteries carry blood from the heart to various body parts. 1. Veins carry blood from different body parts to the heart. 
2. These carry oxygenated blood (except the pulmonary 
artery). 
2. These carry deoxygenated blood (except the pulmonary 
vein). 
3. B lood flows with h igh speed and under high pressure. 3. Blood flows with low speed and under low pressure. 
 
Question 3. 
Fill in the blanks with suitable words given below: 
Answer: 
a. The two lower chambers of the heart are called ventricles. 
b. The pulmonary artery takes the blood from the ventricles to the lungs. 
c. The blood loaded with carbon dioxide from the body comes into the right auricle of 
the heart. 
d. The oxygen-rich blood from the lungs comes into the left ventricle of the heart. 
e. The oxygen-rich blood is pumped into different parts of the body through aorta. 
f. The carbon dioxide loaded blood from right ventricle is pumped into the lungs 
through pulmonary artery. 
g. The instrument used to find out the blood pressure is known 
as sphygmomanometer. 
h. The colour of a red blood cell is due to haemoglobin. 
i. The blood plasma contains a dissolved substance called fibrinogen. 
j. The liquid part of coagulated blood is known as serum. 
Question 4. 
In which organ of our body does blood get oxygenated? 
Answer: 
Blood becomes oxygenated in the lungs. The oxygenated blood is returned to left 
verticles by the pulmonary vein. 
Question 5. 
Which side of the heart (left or right) contains oxygenated blood? 
Answer: 
The left side of the heart contains oxygenated blood. 
Question 6. 
What is the role of haemoglobin in the blood ? 
Answer: 
The haemoglobin is the respiratory pigment which is formed of the iron containing part 
known as haemin and protein part known as globin. It helps to transport respiratory 
gases (oxygen). 
Question 7. 
Name the disease in which the number of platelets reduces to 25,000 – 30,000 per 
cubic mm of blood. State its major symptoms. 
Answer: 
Dengue fever is one such disease in which the number of platelets get reduced to as 
low as 25-30 thousands per cubic mm of blood. The major symptoms of dengue are 
high fever, rashes or red spots on body, nausea or vomiting, pain in abdomen, back, or 
back of the eyes and muscles. 
Long Answer Questions: 
Question 1. 
Given alongside is a diagram of human heart showing its internal structures. Label the 
parts marked 1 to 6, and answer the following questions. 
 
(a) Which type of blood is carried by the blood vessel marked 2? 
(b) Name the main artery which takes the blood from heart to different parts of the 
body? 
(c) Which chamber of the heart receives deoxygenated blood from the body? 
Answer: 
1. Left pulmonary artery 
2. Superior vena cava 
3. Left pulmonary vein 
4. Right auricle 
5. Left auricle 
6. Left ventricle 
(a) Deoxygentated blood. 
(b) Aortic arch (Aorta). 
(c) Right Atrium 
Question 2. 
You can see some blood vessels on the outside of the hands specially in older people. 
Are those veins or arteries ? How can you confirm your answer ? 
Answer: 
In older persons the skin becomes loose as the fat below becomes less with age and 
the vessels passing through these areas especially on the outside of the hands become 
prominent. These are veins as they flow superficially. The veins are thin and less 
muscular. These carry the blood to the heart veins are placed superficially so they are 
easily visible to the eye and are prominent. 
The blood in the veins will be carrying CO2 and will have many substances like sugar, 
amino acids, chemicals and bacteria. 
Question 3. 
Give the functions of lymph. Differentiate between Blood and the lymph. 
Answer: 
Functions of lymph are: 
1. Nutritive: It supplies nutrition and oxygen to those parts where blood cannot 
reach. 
2. Drainage: It drains away excess tissue fluid and metabolites and returns proteins 
to the blood from tissue spaces. 
3. Absorption: It absorbs the fats from the intestine through lymphatics. 
4. Defence: Lymphocytes and monocytes of the lymph function to protect the body. 
The lymphatics also remove bacteria from the tissues.