Antigens are present 
Antigens are foreign proteins, which stimulate specific immune response (antibody) against itself when introduced into the body. They are present on the surface of cell wall.
The correct route through which pulsemaking impulse travels in the heart is 
The pulse making impulse travels in the heart in the order of SA node→AV node→bundle of His→Purkinje fibres→heart muscles.
The blood cancer is known as 
The leukaemia is a type of blood cancer, which is characterized by an uncontrolled increase in the number (through mitosis) of leucocytes in the blood.
Which one of the following vertebrate organs receives the oxygenated blood only ? 
Spleen and brain are the organs which receive only oxygenated blood. In gills and lungs blood picks up oxygen.
Which one of the following statements about blood constituents and transport of respiratory gases is most accurate ? 
RBCs as well as plasma both carry oxygen and CO2 in dissolved and chemically combined form.
Which of the following is not a granulocyte? 
White blood cells are of two types : (i) Granulocytes (with granular cytoplasm) - neutrophils, basophils and eosinophils. (ii) Agranulocytes (with clear cytoplasm) - Lymphocytes and monocytes
The life span of human W.B.C. is approximately 
The life span of WBC ranges from 6 - 20 days, depending on the type, after which they are destroyed in the lymphatic system. When immature WBCs are first released from the bone marrow into the blood, they are called bands or stabs.
In mammals, histamine is secreted by 
Histamine is a potant vasodilator formed by decarboxylation of the amino acid histidine and released by mast cells in response to appropriate antigens.
Mast cells are especially prevalent in the connective tissue of the skin and respiratory tract and in surrounding blood vessels.
An adult human with average health has systolic and diastolic pressures as 
An adult human with average health has systolic and diastolic pressures as 120 mm Hg and 80 mm Hg respectively.
With respect to the ABO group, there are four major blood types because this blood group is determined by 
Blood group is determined by three alleles - IA, IB, and Io. Alleles IA and IB are codominant. Blood group A is determined by IA IA or IA Io. Blood group B is IB IB or IB Io. Blood group O is Io Io. Blood group AB is IA IB.
Contraction of the ventricle in the heart begins by the command from 
SA is the site of generation of the rhythmic cardiac impulse. AV node is a compact mass of myogenic fibres which receives impulse from SA node and transmits it to ventricles. Purkinje fibres are in contact with the contractile muscles of the ventricular walls. Chordae tendinae are the muscles which keep the AV valves in position.
Pulmonary artery differ from pulmonary vein in having 
Arteries have thick wall and narrow lumen while veins have thin walls and large lumen. Arteries do not have valves.
What is true about leucocytes ? 
Leucocytes are colourless, nucleated amoeboid cells found in blood which are devoid of haemoglobin and are capable of coming out of blood capillaries through the process of diapedesis. Fall of WBC count is called leucopenia, and occurs due to folic acid deficiency and AIDS etc.
As the age advances, there is a gradual thinning of hair in human males. This is mainly because of lowered 
Reduced protein synthesis causes thinning of hairs.
Sickle cell anaemia is induced by 
Sickle cell anaemia is a hereditary disorder of autosomal nature caused by mutation of the gene controlling b-chain of haemoglobin. It involves substitution of glutamine by valine.
What is correct for blood group ‘O’? 
Blood group ‘O’ is known as the universal donor since it does not contain antigens.
Impulse of heart beat originates from 
S.A node is called the pacemaker because it initiates the cardiac impulse AV node receives the impulse from the S.A node and transmits it to the ventricles
Which of the following statments is true for lymph? 
Lymph (called tissue fluid in the intercellular spaces) is a vascular tissue consisting of two parts-a clear, colourless fluid matrix, the plasma and floating amoeboid cells, the white blood cells, mostly lymphocytes. It differs from the blood in lacking red blood cells and some blood proteins. The lymph eventually enters the bloods near the heart.
Systemic heart refers to
The answer is Option C because systemic heart refers to systemic circulation of blood, which is done only through the left auricles and left ventricles combined effort.
Bundle of His is a network of 
The atrioventricular bundle (AV bundle), on entering the ventricles splits into right and left branches. These branches then enter the heart muscles. They branch extensively and are called Purkinje fibres. They conduct the cardiac impulse to the ventricular wall.
In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be 
Blood group AB is also known as the universal recipient.
You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the purpose? 
Presence of calcium will remove heparin - blood anti-coagulant and will promote blood clotting. Sodium oxalate and heparin containing test tubes will not allow the blood to clot.
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of
SA node is the natural pacemaker located in the right atrium. SA node initiates the cardiac impulse. So, artificial pacemaker will be grafted at the site of SA node
Damage to thymus in a child may lead to: 
The thymus is a major gland of our immune system. The thymus is responsible for production of T (thymus dervied) lymphocytes from immature lymphocytes, a type of white blood cells responsible for cell mediated immunity. Cell mediated immunity is extremely important for raising immune response against bacteria, yeast, fungi, parasites and virus. It is also critical in protecting against cancer, autoimmune disorders like rheumatoid arthritis, allergies etc.
Which one of the following statements is incorrect ?