Biology

Cardiovascular and Nervous System

981 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

Systole causes

  1. entry of blood into lungs

  2. entry of blood into heart

  3. exit of blood from heart

  4. exit of blood from ventricles
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Systole is the period of contraction of the ventricles of the heart that occurs between the first and second heart sounds. Systole causes the ejection of blood from the ventricle into the aorta and the pulmonary trunk.

Multiple choice

The mitral valve is present

  1. between the right auricle and right ventricle

  2. between the inferior vena cava and right auricle

  3. between the left auricle and left ventricle

  4. between the left auricle and right auricle

  5. between the aorta and left ventricle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mitral valve also known as a bicuspid valve is present between the left auricle and left ventricle.

Multiple choice

What causes the first heart sound or the "lub"?

  1. The sound of blood rushing out of the ventricles

  2. The closing of the mitral and tricuspid valves

  3. The closing of the pulmonary and aortic valves

  4. The sound of blood rushing into the auricles

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The first heart sound or "lub" results from closure of the tricuspid and mitral valves.

Multiple choice

When does the auricles contract?

  1. During atrial systole

  2. Before atrial systole

  3. During atrial diastole

  4. Before atrial diastole

  5. After atrial diastole
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The auricles contract during auricular or atrial  systole.

Multiple choice

Cardiac impulse is produced by SA node and impulse is transmitted to the AV node, from which it passed through bundle of His and then reaches Purkinje fibre. Purkinje fibres are responsible for

  1. carrying impulse to auricles

  2. distributing cardiac impulse from bundle of His to walls of ventricles

  3. controlling the opening of A.V.V

  4. controlling the opening of S.L.V

  5. carrying impulse to the cardiac muscle of right auricle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It causes ventricular systole, i.e. blood is ejected out of the ventricles in the pulmonary and systemic circulation respectively.

Multiple choice

The upper chambers of the heart are called

  1. aorta

  2. vena cava

  3. atria

  4. pericardium

  5. ventricles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer. Atria are the two upper cavities of the heart from which blood is passed to the ventricles. 

Multiple choice

The LUB sound of heart is caused due to

  1. closing of AV valves

  2. closing of SLV

  3. opening of AVV

  4. opening of SLV

  5. atrial systole
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It occurs just after the atrial systole, and it is known as first heart sound. It is heard like LUB.

Multiple choice

The pacemaker of human heart is

  1. sinoatrial node

  2. atrio ventricular node

  3. tricuspid valve

  4. bundle of His
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sinoatrial node is the pacemaker of human heart.

Multiple choice

'Syncope' occurs during operative processes due to __________.

  1. cerebral edema

  2. cerebral hyperemia

  3. cerebral hypoxia

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

Syncope is a general term referring to a sudden, transient loss of consciousness that usually occurs secondary to a period of cerebral ischemia leading to cerebral hypoxia.

Multiple choice

Which of the following statements is/are correct?

a. The human heart has four chambers, namely the ventricles and the atria. b. The atria pump blood into various organs with high pressure. c. A sheath of tissue called pericardium separates the chambers of the heart.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. a only
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer as this statement is correct. The human heart has four chambers, namely the ventricles and the atria. The ventricles are the lower chambers and the atria are the upper chambers.

Multiple choice

Noradrenaline increases blood pressure by

  1. vasoconstriction

  2. increasing HR

  3. increasing preload

  4. increasing myocardial contractility
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The primary mechanism of noradrenaline in increasing the blood pressure is by increasing the myocardial contractility.