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NEET Exam  >  NEET Notes  >  Biology Class 11  >  Important Diagrams: Body Fluids and Circulation

Important Diagrams: Body Fluids and Circulation | Biology Class 11 - NEET PDF Download

1. Formed Elements

1. Formed Elements

2. Human Heart

2. Human Heart

3. Electrocardiogram (ECG) and Cardiac Cycle

3. Electrocardiogram (ECG) and Cardiac Cycle

4. Double Circulation

4. Double Circulation

Regulation of Heart

Regulation of Heart

Diagrams Based Questions NEET

Q1: Following are the stages of pathway for conduction of an action potential through the heart (NEET 2024)
A. AV bundle
B. Purkinje fibres
C. AV node
D. Bundle branches
E. SA node

Choose the correct sequence of pathway from the options given below
(a) E-C-A-D-B
(b) A-E-C-B-D
(c) B-D-E-C-A
(d) E-A-D-B-C
Ans: (a)

Diagrams Based Questions NEET

The electrical conduction pathway of the heart is a precisely timed route that ensures coordinated contraction. Roles of the components are:

  • SA node (Sinoatrial node): the primary pacemaker that initiates the impulse causing atrial depolarisation and atrial contraction.
  • AV node (Atrioventricular node): receives the impulse from the SA node and provides a brief delay so the ventricles can fill before they contract.
  • AV bundle (Bundle of His): transmits impulses from the AV node into the interventricular septum.
  • Bundle branches: conduct impulses down the left and right sides of the interventricular septum toward the ventricular walls.
  • Purkinje fibres: distribute the impulse throughout the ventricles to produce a rapid and coordinated ventricular contraction.

Following these steps in order gives the correct conduction sequence:

  • SA node (E)
  • AV node (C)
  • AV bundle (A)
  • Bundle branches (D)
  • Purkinje fibres (B)

Thus, the sequence E-C-A-D-B matches option (a), which is why the answer is Option (a).

Q2: Match List I with List II : (NEET 2024)

Diagrams Based Questions NEET

Choose the correct answer from the options given below :
(a) A-I, B-III, C-IV, D-II
(b) A-III, B-II, C-IV, D-I
(c) A-II, B-III, C-I, D-IV
(d) A-IV, B-II, C-I, D-III
Ans: (b)

Diagrams Based Questions NEET

Sol: The correct answer is option no. (B) as

  • A. P wave - III. Depolarisation of atria.
  • B. QRS complex - II. Depolarisation of ventricles.
  • C. T wave - IV. Repolarisation of ventricles.
  • D. T-P gap - I. Heart muscles are electrically silent.
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FAQs on Important Diagrams: Body Fluids and Circulation - Biology Class 11 - NEET

1. What are the main formed elements of blood and their functions?
Ans. The formed elements of blood include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Red blood cells transport oxygen from the lungs to the body and carbon dioxide from the body back to the lungs. White blood cells are crucial for the immune response, helping to fight infections and diseases. Platelets play a key role in blood clotting, preventing excessive bleeding when injuries occur.
2. What is the structure and functional significance of the human heart?
Ans. The human heart is a muscular organ with four chambers: two atria and two ventricles. The right side of the heart pumps deoxygenated blood to the lungs for oxygenation, while the left side pumps oxygenated blood to the rest of the body. The heart has valves that prevent backflow, ensuring efficient blood circulation. Its rhythmic contractions maintain blood pressure and supply essential nutrients and oxygen to tissues.
3. How does an electrocardiogram (ECG) work and what does it measure?
Ans. An electrocardiogram (ECG) is a test that records the electrical activity of the heart over time. It measures the time interval between heartbeats and the size and position of the heart chambers. Electrodes placed on the skin detect electrical signals, creating a graph that indicates heart rhythm, rate, and abnormalities like arrhythmias, ischemia, or heart attacks.
4. What is double circulation and why is it important for humans?
Ans. Double circulation refers to the two separate circuits of blood flow in humans: the pulmonary circulation (between the heart and lungs) and systemic circulation (between the heart and the rest of the body). This system ensures that oxygen-rich blood is efficiently delivered to tissues while deoxygenated blood is transported to the lungs for oxygenation. It allows for higher metabolic rates and supports the body's energy needs.
5. What are the key diagrams to study for body fluids and circulation in NEET?
Ans. Important diagrams to study for body fluids and circulation in NEET include the structure of the heart, the pathway of blood flow through the heart and lungs, the components of blood, and the electrocardiogram waveform. Understanding these diagrams helps in visualizing the concepts of circulation, blood composition, and heart function, which are essential for exam preparation.
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