Body Fluids and Circulation NEET Questions — Free MCQ Practice

Body Fluids and Circulation MCQs for NEET — Zoology Questions with Answers

Practice free Body Fluids and Circulation (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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Bundle of His includes:

Purkinje fibres + left AV bundle

Purkinje fibres + right AV bundle

Purkinje fibres + right and left AV bundle

SA node + AV node + AV bundle

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Explanation

NCERT, P -284, Para 2

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Which one of the following is wrong with respect to nodal tissue.

auto excitable

not localized to a single chamber.

equal ability to excite throughout nodal tissue.

structural changes are observed throughout nodal musculature in different chambers of the heart.

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Explanation

NCERT, P -284, Para 2

The entire heart is made up of cardiac muscles. A specialized cardiac musculature called the nodal tissue is also distributed in the heart. A patch of this tissue called SA node and another mass of this tissue called AV node is also present. Although all the heart muscle cell have the ability to generates the electrical impulses or action potentials but SA node generates maximum number of action potentials (70-75/min).

so there is no equal ability to excite throughout nodal tissue.

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The duration of cardiac cycle is–

0.8 second

0.5 second

0.3 second

0.4 second

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Explanation

NCERT, P -285, Para 2

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The number of action potential generated by SAN:

70–75 times per minute.

50–72 times per minute.

Exact 70 times per minute.

not more than 60 times per minute.

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Explanation

NCERT, P -284, Para 2

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The route of action potential in heart is

SA node – AV node – AV bundle

AV node – SA node – bundle of his – AV bundle

SA node – AV node – AV bundle – Bundle of His

SA node – AV node – Purkinje fibres

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Explanation

NCERT, P -284, Para 2

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The sequence of opening (O) and closing (C) of heart –valves are:

AV valves open before the closure of SL or semilunar valves.

AV valves close before the closure of SL or semilunar valves.

AV valves open after the closure of SL or semilunar valves.

AV valves close with closure of SL or semilunar valves.

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Explanation

As blood has to be pumped through AV valves and then through SL valves. So lasting closing will be of SL valve and after closing of SL valves AV valve will open- READ CARDIAC CYCLE- P- 284, 285

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The results of ECG are known as

Electrocardiogram

Electrocardiograph

MRI

Biopsy

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Explanation

NCERT, P -285, ECG

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The standard ECG is obtained by connecting the patient to the machine with how many leads?

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Explanation

NCERT, P -286, Para 1

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If one wants to analyse the detailed cardiac activity, the multiple leads are attached to–

Wrist and arms

Abdomen

Chest region

all the fingers

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Explanation

NCERT, P -286, Para 1

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What does the QRS complex represent in ECG?

Atrial Diastole

Atrial systole

ventricular systole

Joint Diastole

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Explanation

NCERT, P -286, Para 4

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