• Circulation of Body Fluids
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Circulation of Body Fluids

Description: Mutation Human HeartAnatomy of Human HeartHeart Beat and its ControlNervous Control of HeartDouble CirculationHuman Circulatory SystemDisorders of Circulatory System
Number of Questions: 15
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Tags: Mutation Human Heart Anatomy of Human Heart Heart Beat and its Control Nervous Control of Heart Double Circulation Human Circulatory System Disorders of Circulatory System
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What is the contraction phase of the heart called?

  1. Diastole

  2. Pulse rate

  3. Systole

  4. Cardiac cycle

Show answer
Correct Option: C
Explanation:

The contraction phase of the heart is called systole.

What is the relaxation phase of the heart called?

  1. Systole

  2. Diastole

  3. Flaccidity

  4. Blockage

Show answer
Correct Option: B
Explanation:

Diastole is the relaxation phase of the heart.

What happens in ventricular diastole?

  1. Simultaneous contraction of both ventricles

  2. Opening of semilunar valves so that the blood can go to aorta

  3. Ventricle relaxes and the auricles also relax

  4. Contraction of one ventricle

Show answer
Correct Option: C
Explanation:

This phase is called ventricular diastole and is known as general phase.

What is stroke volume?

  1. The volume of blood entering into the auricles at each heart beat

  2. The volume of blood ventricles pump at each heart beat

  3. The volume of blood pumped daily by heart

  4. The volume of blood pumped by heart per minute

Show answer
Correct Option: B
Explanation:

At each heart beat ventricles pump about 70 ml of blood. This volume is called stroke volume.

What is the function of SA node?

  1. It is the site from where impulses for contraction originate.

  2. It prevents the valves from being pushed into the auricles at the time of ventricular contraction.

  3. It separates the two ventricles.

  4. It protects the heart against injury and friction.

Show answer
Correct Option: A
Explanation:

Mammalian heart is myogenic heart, i.e heartbeat originates from muscle. The specialised area where impulses for contraction originate is called SA node.

Human heart is myogenic. What is the meaning of this statement?

  1. Heartbeat originates from nerves

  2. Heartbeat originates from a muscle

  3. Heartbeat is under hormonal control

  4. Heartbeat is under chemical control

Show answer
Correct Option: B
Explanation:

Heartbeat originates from a muscular patch in the right auricle known as SA node. Thus, heartbeat originates from a muscle.

How do the waves travel from SA node to ventricles?

  1. SA node - Purkinje fibres - Bundle of His - AV node - Ventricles

  2. SA node - Bundle of His - Purkinje fibres - AV node - Ventricles

  3. SA node - A.V. node - Bundle of His - Purkinje fibres - Ventricles

  4. SA node - AV node - Purkinje fibrres - Ventricles

Show answer
Correct Option: C
Explanation:

AV node picks up the wave of contraction propagated by SA node. The waves then pass through the Bundle of His, which passes down the intraventricular septum and divides into two branches, one of which is distributed to each ventricle through a fine network of Purkinje fibres. In this way, wave of contraction travels up to the ventricles.

Where is the sinoauricular node situated?

  1. Base of the right auricle

  2. Wall of the right auricle

  3. Between the left auricle and left ventricle

  4. Between the right auricle and the right ventricle

Show answer
Correct Option: B
Explanation:

The specialised tissue called SA is present close to the entrance of superior vena cava in the right auricle.

Which is the only direct muscular communication between auricle and ventricle?

  1. AV node

  2. Bundle of His

  3. Purkinje fibres

  4. SA node

Show answer
Correct Option: B
Explanation:

Bundle of His is the only direct muscular communication link between the auricle and ventricle.

What is meant by cardiac output in humans?

  1. It is heartbeats/min.

  2. It is volume of blood pumped/min.

  3. It is the capacity of the heart to store blood.

  4. It is the general pause of cardiac activity.

Show answer
Correct Option: B
Explanation:

Our heart pumps approx. 5040 ml of blood per minute. This is known as cardiac output.

Purkinje fibres are present in the

  1. auricles

  2. AV node

  3. interior surface of the ventricles

  4. pericardium

Show answer
Correct Option: C
Explanation:

Purkinje fibres run on the interior surface of the ventricles to join the working cardiomyocytes.

What is the function of bundle of His?

  1. It relays cardiac impulses to the ventricular cells.

  2. It transmits impulses from the atrioventricular node.

  3. It plays a role in the regulation of heartbeat/rhythm.

  4. It initiates the nerve impulse.

Show answer
Correct Option: B
Explanation:

The bundle of His is an important part of the electrical conduction system of the heart as it transmits impulses from the atrioventricular node.

Which of the following chemicals lower(s) the hear rate?

  1. Acetylcholine

  2. Pilocarpine

  3. Both (1) and (2)

  4. Atropine

Show answer
Correct Option: C
Explanation:

Both acetylcholine and pilocarpine lower the heart rate.

Where does the cardiac center lie in the brain?

  1. Cerebrum

  2. Cerebellum

  3. Medulla

  4. Forebrain

Show answer
Correct Option: C
Explanation:

The cardiac centre lies in the medulla of the brain and is formed of cardioinhibitor and cardioacclerator.

What is the difference between pulse rate and heart rate?

  1. They are numerically different.

  2. They are one and the same.

  3. Pulse is the expansion and contraction of artery, whereas heart rate is contraction and relaxation of heart muscles.

  4. Pulse rate doesn't change with strenuous exercise, whereas heart rate increases with vigorous exercise.

Show answer
Correct Option: C
Explanation:

The difference is that pulse is expansion and contraction of artery, whereas heart rate is contraction and relaxation of heart muscles.

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