Cardiac Cycle

IMPORTANT

Cardiac Cycle: Overview

This topic covers concepts, such as P-wave in Electrocardiogram, QRS complex in Electrocardiogram, T-wave in Electrocardiogram, Cardiac Cycle, Joint Diastole, Atrial Systole, Ventricular Systole, Cardiac Output, etc.

Important Questions on Cardiac Cycle

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IMPORTANT

Biology>Body Fluids and Circulation>Cardiac Cycle> Q 1

Match the following

	List - I		List - II
a	Enlarged $P$ wave	i	Hyper calcimia
b	Prolonged $Q - T$ interval	ii	Tachy cardia
c	Prolonged $P - R$ interval	iii	Brady cardia
d	Shortened $P - R$ interval	iv	Myocardial infraction
		v	Enlarged atria

The correct answer is

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Biology>Body Fluids and Circulation>Cardiac Cycle> Q 2

Which one of the following is a matching pair?

a) Lubb - sharp closure of AV valves at the beginning of ventricular systole

b) Dub - sudden opening of semilunar valves at the beginning of ventricular diastole

c) Pulsation of the radial artery - valves in the Arteries

d) Initiation of the heart beat - Purkinje fibres

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Biology>Body Fluids and Circulation>Cardiac Cycle> Q 3

During ventricular systole in a mammalian heart the

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Biology>Body Fluids and Circulation>Cardiac Cycle> Q 4

P wave of ECG indicates:
1. Activation of SA node.
2. Depolarization of atrial muscles.
3. Spread of excitation from AV node to Purkinje fibres.
4. Repolarisation of atria and depolarization of ventricles.

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Biology>Body Fluids and Circulation>Cardiac Cycle> Q 5

The diagram given here is the standard $ECG$ of a normal person. The $P$ - wave represents the?

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