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

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

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What would be the cardiac output of a person having 72 heartbeats per minute and a stroke volume of $50 m l$ ?

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Important Questions on Body Fluids and Circulation

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A regular check on the unborn baby of a lady towards the end of her pregnancy showed a heart rate of 80 beats per minute. What would the doctor infer about the baby's heart condition from this?

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Which of the following is associated with decrease in cardiac output?

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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	$(d)$	$0.8 \sec$
		$(e)$	$0.3 \sec$

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

Match the different types of heart given in column A with organisms given in column B. Choose the correct combination.

Column A	Column B
P. Neurogenic heart.	i. Human
Q. Bronchial heart.	ii. King crab
R. Pulmonary heart.	iii. Shark

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Write the name of device used to measure the blood-pressure.

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Which one of the following statements is correct?

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

Reason $(R)$ : The sound is due to closure of semilunar valves present at the bases of aortic arches.

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Purkinje fibres are located in the following structure/s

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What is blood pressure? What is the approximate value of normal systolic pressure and diastolic pressure?

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

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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

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Calculate the cardiac output on an individual having

70

heartbeats/min with a stroke volume of

55 mL .

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The QRS complex in a standard ECG represents:

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What does the QRS wave indicate in ECG?

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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

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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

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

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How do parasympathetic neural signals affect the working of the heart?

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In humans, during one cardiac cycle, diastole takes place for how many seconds in the ventricle?

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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?

What would be the cardiac output of a person having 72 heartbeats per minute and a stroke volume of 50 ml?

Important Questions on Body Fluids and Circulation

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What would be the cardiac output of a person having 72 heartbeats per minute and a stroke volume of $50 m l$ ?