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

In which of the following defects, the valve orifice fails to develop?

  1. Atherosclerosis

  2. Arrhythmias

  3. Constrictive pericarditis

  4. Pulmonary atresia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pulmonary atresia is a congenital malformation of the pulmonary valve in which the valve orifice fails to develop. The valve is completely closed thereby obstructing the outflow of blood from the heart to the lungs.

Multiple choice

Stenosis refers to :

  1. widening of heart vessels

  2. pain in heart muscles

  3. narrowing of heart vessels

  4. accumulation of cholesterol in heart vessels
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Narrowing of heart vessels may occur due to clogging by cholesterol or other reasons and abnormal narrowing is called stenosis.

Multiple choice

The mitral valve lies between ______________.

  1. the left atrium and the left ventricle

  2. the right atrium and the right ventricle

  3. the left ventricle and the aorta

  4. the right ventricle and the pulmonary artery

  5. the right atrium and the venacava
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The mitral valve is the bicuspid valve found between the left atrium and the ventricle. The function of the valve is to prevent back flow of blood into the left atrium.

Multiple choice

The Bundle of His is situated in _____________.

  1. ventricles

  2. atria

  3. interatrial septum

  4. interventricular septum

  5. atrioventricular valve
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The left and the right ventricles are separated from each other by a partition called the interventricular septum. Bundle of His is situated in the interventricular septum. It branches and forms a network of fibres throughout the walls of ventricles. These fibres are called the Purkinjee fibres.

Multiple choice

Which of the following causes vasodilation in the kidneys?

  1. Angiotensin II

  2. Epinephrine

  3. Prostaglandins

  4. ADH

  5. Non-steroidal anti-inflammatory drugs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Prostaglandins are powerful vasodilators and there is a normal tonic level of vasodilation in the renal blood vessels, which is caused by the prostaglandins.

Multiple choice

What is systole?

  1. The contraction of heart

  2. The expansion of heart

  3. The nodes containing lymphocytes

  4. The circulation of extracellular fluid in human body

  5. The rhythmic contraction and relaxation of heart muscles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is correct as the phase of heart when it contracts and pumps blood into veins is called systole.