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

Heme is converted to bilirubin mainly in

  1. kidney

  2. liver

  3. spleen

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

Breakdown of heme to bilirubin occurs in macrophages of the reticulo-endothelial system. Major sites of bilirubin production are spleen and other compartments of reticuloendothelial system, which degrade the haemoglobin of injured RBCs. Other sites are liver and bone marrow.

Multiple choice

Which of the following statements is true about heart?

  1. The right auricle has thicker wall than left ventricle.

  2. Left auricle has thicker wall than left ventricle.

  3. Left ventricle has thicker wall than right ventricle.

  4. Right ventricle has thicker wall than left ventricle.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Left ventricle has the thickest wall and it pumps blood in the body.

Multiple choice

While using a stethoscope, a physician hears a sound of ‘LUBB’. Which activity is responsible for producing this sound?

  1. Opening of mitral and tricuspid valves

  2. Closing of mitral and tricuspid valves

  3. Closing of aortic semilunar valves

  4. Opening of pulmonary semilunar valves
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The first sound ‘LUBB’ is produced when the ‘atrio-ventricular’ valves get closed sharply at the start of ventricular systole.

Multiple choice

Tricuspid valve is present between __________.

  1. right atrium and left ventricle

  2. right and left atrium

  3. right ventricle and pulmonary artery

  4. left atrium and left ventricle

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

Tricuspid valve is present between the right atrium and left ventricle.

Multiple choice

What is pulse pressure?

  1. Systolic pressure

  2. Diastolic pressure

  3. Difference between systolic and diastolic pressures

  4. Sum of systolic and diastolic pressures

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

The pressure difference between systolic and diastolic pressures is the pressure change to create the pulse, which is the pulse pressure.

Multiple choice

A person, who is an old case of MI (myocardial infarction), goes to his doctor for a routine check up. What change will be seen on his ECG recording?

  1. P wave changes

  2. T wave changes

  3. Q wave changes

  4. QRS pattern changes

  5. No change in the ECG recording occurs in MI
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pathologic Q waves are not an early sign of myocardial infarction, but generally take several hours to days to develop.They are the result of absence of electrical activity.