Waec Model Questions Vol1 2024 Biology Question 8

Practice essay / theory question 8 from the 2024 Waec Model Questions Vol1 Biology examination. This question covers coordination, circulatory system .

Waec Model Questions Vol1 2024 Biology Essay / Theory
Topics: coordination circulatory system
Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • essay
Waec Model Questions Vol1 2024 Biology Question 8 diagram

The labelled diagram of the human heart is provided. It shows the four chambers, the four major valves, the major vessels entering and leaving the heart and a marked hole in the interventricular septum indicating a ventricular septal defect (VSD).

Question Parts

( a )
Describe, in the correct sequential order, the complete pathway of blood through the heart starting from the systemic circulation (vena cava) to the pulmonary circulation (pulmonary artery). State the chambers and vessels involved at each step.
( b )
If the right ventricle pumps 5.0 L of blood per minute into the pulmonary artery and the heart rate is 75 beats per minute, calculate the stroke volume of the ventricle in millilitres per beat. Show the formula you use and the intermediate steps.
( c )
Discuss two physiological mechanisms that regulate heart rate during moderate to intense exercise, linking each mechanism to the autonomic nervous system.
( d )
The diagram indicates a ventricular septal defect (VSD). Explain how this defect alters the normal flow of blood through the heart and describe two possible clinical consequences of a large VSD.

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About This Question

This is Waec Model Questions Vol1 2024 Biology Question 8. It is one of the essay questions from the 2024 Waec Model Questions Vol1 Biology examination.

The question covers coordination, circulatory system .

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