Match the Column - I with Column - II: Column – I Column II a P – wave i Depolarisation of ventricles b QRS complex i i Repolarisation of ventricles c T – wave i i i Coronary ischemia d Reduction in the size of T - wave i v Depolarisation of atria v Repolarisation of atria Select the correct option

a - i v ; b - i ; c - i i ; d - i i i

a - i v ; b - i ; c - i i ; d - v

a - i i ; b - i ; c - v ; d - i i i

a - i i ; b - i i i ; c - v ; d - i v

Match the following related to the cardiac cycle. Column I Column II i Cardiac Cycle a 0 . 2 sec ii Atrial Systole b 0 . 4 sec iii Ventricular Systole c 0 . 1 sec iv Cardiac Diastole d 0 . 8 sec e 0 . 3 sec

i - d , ii - c , iii - e , iv - b

i - d , ii - c , iii - b , iv - e

i - b , ii - c , iii - e , iv - d

i - d , ii - a , iii - e , iv - b

EASY

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What is correct about sinus venosus?

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Important Questions on Body Fluids and Circulation

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

In a standard ECG, one of the following functions of its components is not correctly interpreted.

MEDIUM

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Statement (S): The sinoatrial node is called 'Pace-maker'.

Reason (R): The sinoatrial node contains specialised cardiomyocytes and generates action potentials without any external stimuli.

The correct answer is

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Calculate the cardiac output on an individual having

70

heartbeats/min with a stroke volume of

55 mL .

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Assertion (A): Pulmonary aorta in human embryo communicates with systemic aorta by a thin vessel called ductus arteriosus.
Reason (R): In the heart of the human embryo, oxygenated and deoxygenated blood is completely separated.

MEDIUM

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Recognize the figure and find out the correct matching?

Question Image

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Purkinje fibres are located in the following structure/s

MEDIUM

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

In the electrocardiogram, QRS complex stands for:

Question Image

MEDIUM

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Match the Column - I with Column - II:

	Column – I		Column II
$(a)$	P – wave	$(i)$	Depolarisation of ventricles
$(b)$	QRS complex	$(i i)$	Repolarisation of ventricles
$(c)$	T – wave	$(i i i)$	Coronary ischemia
$(d)$	Reduction in the size of T - wave	$(i v)$	Depolarisation of atria
		$(v)$	Repolarisation of atria

Select the correct option

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

The QRS complex in a standard ECG represents:

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Match the following related to the cardiac cycle.

Column I		Column II
$(i)$	Cardiac Cycle	$(a)$	$0.2 \sec$
$(ii)$	Atrial Systole	$(b)$	$0.4 \sec$
$(iii)$	Ventricular Systole	$(c)$	$0.1 \sec$
$(iv)$	Cardiac Diastole	$(d)$	$0.8 \sec$
		$(e)$	$0.3 \sec$

MEDIUM

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

The diagram below shows a typical $ECG$ .

Question Image

If the $AV$ node is not functional, which of the following options correctly represents the changes seen in the $ECG$ ?

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Assertion (A): Heart of fishes is called branchial heart.
Reason (R): It receives deoxygenated blood from body parts.
The correct option among the following is

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Sketch and label the conducting system of human heart.

HARD

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Explain the internal structure of human heart. (diagram not necessary)

EASY

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Write notes on the working of the heart of man.

MEDIUM

Biology>Human Physiology>Body Fluids and Circulation>Circulatory Pathways

Assertion $(A)$ : Dub' is one of the sounds of the heart caused during a cardiac cycle.