Biology

Cardiovascular and Nervous System

983 Questions

Review the human cardiovascular system through these competitive exam practice questions. Key areas include heart valves, cardiac impulse pathways, and blood pressure regulation. A solid grasp of these fundamentals is crucial for science sections.

Heart anatomy and valvesCardiac impulse conductionBlood pressure mechanicsHeartbeat regulation

Cardiovascular and Nervous System Questions

Multiple choice

Mitral valve in mammalian heart is situated between

  1. pulmonary vein and left auricle

  2. left atrium and left ventricle

  3. right atrium and right ventricle

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mitral valve is the valve between the left atrium and the left ventricle of the heart, which has two tapered cusps.

Multiple choice

Tricuspid valve is present between

  1. right auricle and left ventricle

  2. right auricle and right ventricle

  3. left auricle and right ventricle

  4. left auricle and left ventricle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The tricuspid valve is located between the right atrium (auricle) and right ventricle. It prevents backflow of blood from the ventricle to the atrium. Options A, C, and D incorrectly place the valve involving left-sided chambers.

Multiple choice

The heart has ________ chambers.

  1. four

  2. five

  3. two

  4. three
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Four is correct. The human heart has four chambers: right atrium, right ventricle, left atrium, and left ventricle. This is a fundamental anatomical fact. Fish hearts have two chambers, amphibian hearts have three, but mammalian hearts have four.

Multiple choice

The two upper chambers are left atrium and _____.

  1. left ventricle

  2. right atrium

  3. right ventricle

  4. aorta
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Right atrium is correct because the two upper chambers of the heart are the left atrium and right atrium. The lower chambers are ventricles. Aorta is the main artery, not a chamber. This is basic heart anatomy.

Multiple choice

Two lower chambers are left ventricle and _______.

  1. left atrium

  2. right atrium

  3. right ventricle

  4. aorta
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). The question specifically asks for the TWO LOWER CHAMBERS, which are the left ventricle and right ventricle. The atria receive blood; the ventricles pump blood out.

Multiple choice

Heart attack occurs due to

  1. damage of heart due to sudden emotional burst

  2. falling of heart

  3. damage of heart due to blood supply

  4. stopping of heart
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A heart attack, or myocardial infarction, occurs when the blood flow to a part of the heart is blocked. This lack of blood supply prevents the heart muscle from receiving oxygen, leading to tissue damage or death.

Multiple choice

How many chambers are present in human heart?

  1. One

  2. Two

  3. Three

  4. Four

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The human heart consists of four chambers: two upper atria and two lower ventricles. This structure allows for the complete separation of oxygenated and deoxygenated blood, which is essential for efficient double circulation in mammals. This separation ensures that oxygen-rich blood is delivered to the body at high pressure.

Multiple choice

What is the normal pulse rate of humans?

  1. 70 - 80 per minute

  2. 2 beats per second

  3. 80 -90 per minute

  4. 97 beats per minute
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A healthy adult's resting heart rate typically ranges from 60 to 100 beats per minute. The range of 70 to 80 beats per minute is considered a normal and healthy average for most individuals.

Multiple choice

The sounds in the heart are created by

  1. contraction and relaxation of auricles and ventricles

  2. valves which regulate the flow of blood in the heart

  3. pericardium

  4. SA node

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Various valves present at the inlet and outlet of ventricles regulate the flow of blood in heart. Action of these valves creates the heart sounds.

Multiple choice

Murmur sound is produced in the heart due to

  1. blockage of arteries

  2. improper functioning of bundle of his

  3. leakage of blood through the valves

  4. change in the elasticity of blood vessels

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Leakage of blood through the valves produces murmur sound.

Multiple choice

What is pulse pressure?

  1. Increase in arterial pressure

  2. Difference in systolic and diastolic pressure

  3. Decrease in arterial pressure

  4. Fall in pressure of alveoli below atmospheric pressure

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The difference in systolic and diastolic pressure is called pulse pressure.