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Assertion Reason Test: Body Fluids & Circulation - NEET MCQ


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9 Questions MCQ Test - Assertion Reason Test: Body Fluids & Circulation

Assertion Reason Test: Body Fluids & Circulation for NEET 2024 is part of NEET preparation. The Assertion Reason Test: Body Fluids & Circulation questions and answers have been prepared according to the NEET exam syllabus.The Assertion Reason Test: Body Fluids & Circulation MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion Reason Test: Body Fluids & Circulation below.
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Assertion Reason Test: Body Fluids & Circulation - Question 1

A: The cardiac impulse which originates from the SA node in the mammalian heart cannot spread directly from atria to ventricles.

R: In the mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 1

SA node → AV node → Bundle of His → Bundle branch → Purkinje fibre → Ventricle wall

Assertion Reason Test: Body Fluids & Circulation - Question 2

A: First phase of ventricular filling is rapid and causes 3rd sounds of the heart.

R: It is because of the auricular systole.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 2
It is because of the opening of the AV valve.

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Assertion Reason Test: Body Fluids & Circulation - Question 3

A: Dub is a long and sharp sound.

R: It is caused by the closing of atrioventricular valves.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 3
Dup has high pitch and of short duration.

Assertion Reason Test: Body Fluids & Circulation - Question 4

A: Portal system consists of veins which start from capillaries and end into capillaries.

R: All vertebrates have hepatic portal systems.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 4
A unique vascular connection exists between the digestive tract and liver called hepatic portal system.

Assertion Reason Test: Body Fluids & Circulation - Question 5

A: Left ventricle pumps blood at a much higher pressure to all body parts involved in the systemic circulation.

R: The muscular wall of left ventricle is two to four times as thick as the wall of the right ventricle.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 5
Left ventricle has the thickest wall.

Assertion Reason Test: Body Fluids & Circulation - Question 6

A: The resting heart rate, about 75/minutes, usually is lower than the autorhythmic rate of the SA node (90 – 100 beats/minute).

R: At rest condition, the parasympathetic effects dominate.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 6
The signals from parasympathetic nervous system decreases the heart rate.

Assertion Reason Test: Body Fluids & Circulation - Question 7

A: Elevated levels of Na+ increases the heart rate and contractility.

R: Elevated Na+ level increases the excitability of SA nodes.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 7
Elevated levels of Na+ decreases the heart rate and contractility.

Assertion Reason Test: Body Fluids & Circulation - Question 8

A: Endocardium provides a smooth lining for the inside of the heart and covers the valves of the heart.

R: Endocardium is continuous with the endothelial lining of the large blood vessels associated with the heart and the rest of the cardiovascular system.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 8
Inner wall of heart is endocardium.

Assertion Reason Test: Body Fluids & Circulation - Question 9

A: Isovolumetric systole of a normal cardiac cycle is responsible for opening semilunar valves, causing the blood flow into aortic aorta and pulmonary aorta.

R: During isovolumetric systole, intraventricular pressure increases as semilunar and AV valves are closed, and ventricles are contracting.

Detailed Solution for Assertion Reason Test: Body Fluids & Circulation - Question 9
There is no change in the volume of blood in ventricles during isovolumetric systole.
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