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

ECG is used for the diagnosis of ailment of the

  1. heart

  2. kidneys

  3. brain

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

 By measuring the activity of the heart via electrodes attached to the patient's skin, ECG can help diagnose abnormal heartbeat and other cardiac problems. ECG is used for the diagnosis of ailment of the heart.

Multiple choice

The chest wall becomes stiff in old age, because

Directions: Read the passage and answer the question.

The functional declines of advancing age are depressing. The heart’s ability to pump blood drops about one per cent: blood flow to arms and legs decreases by thirty to forty per cent in old age. The amount of air a person can exhale after a deep breath lessens and the chest wall stiffens with age. However, recent studies have shown that most of these age associated declines can be delayed by exercise. Exercise lowers the resting heart - rate and increases the amount of blood pumped with each beat in older people. When stress is placed on bones through exercise, calcium content rises, with the result that resistance to fracture is improved.

  1. The heart’s ability to pump blood to it drops about one per cent

  2. The blood flow to various organs decreases

  3. The resting heart - rate becomes high

  4. The person’s ability to exhale sufficient air lessens
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Line 3 of the passage

Multiple choice

Old age is generally a depressing period because

Directions: Read the passage and answer the question.

The functional declines of advancing age are depressing. The heart’s ability to pump blood drops about one per cent: blood flow to arms and legs decreases by thirty to forty per cent in old age. The amount of air a person can exhale after a deep breath lessens and the chest wall stiffens with age. However, recent studies have shown that most of these age associated declines can be delayed by exercise. Exercise lowers the resting heart - rate and increases the amount of blood pumped with each beat in older people. When stress is placed on bones through exercise, calcium content rises, with the result that resistance to fracture is improved.

  1. old people worry more than others

  2. old people tend to regret their past

  3. various organs of the body function less efficiently

  4. old people do very little work
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The functional declines of advancing age are depressing.

Multiple choice

Which of the following instruments is used to hear the heartbeat?

  1. Sphygmomanometer

  2. Stethoscope

  3. Baroscope

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

The stethoscope is an acoustic medical device for auscultation or listening to the internal sounds of an animal or human body. It typically has a small disc-shaped resonator that is placed against the chest and two tubes connected to earpieces. It is often used to listen to the sounds of lungs and heart.

Multiple choice

A resting person, usually has a pulse rate between

  1. 80-90 beats per minute

  2. 70-80 beats per minute

  3. 70-75 beats per minute

  4. 72-80 beats per minute
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The number of beats per minute is called the pulse rate. A resting person, usually has a pulse rate between 72 and 80 beats per minute

Multiple choice

What constitutes a heartbeat?

  1. Rhythmic relaxation only

  2. Rhythmic contraction only

  3. Rhythmic contraction and relaxation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The walls of the chambers of the heart are made up of muscles. These muscles contract and relax rhythmically. This rhythmic contraction followed by its relaxation constitute a heartbeat.

Multiple choice

Excessive cholesterol intake leads to thickening of arteries called

  1. rhematic heart

  2. atherosclerosis

  3. blood pressure

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

Atherosclerosis is the thickening and hardening of arteries due to cholesterol and plaque buildup. Rheumatic heart is caused by streptococcal infection, blood pressure is a measurement, and cardiac arrest is sudden heart stoppage - none describe the gradual thickening process from cholesterol.

Multiple choice

The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will replace the function of

  1. purkinje system

  2. sinoatrial node

  3. atrioventricular node

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

The sinoatrial (SA) node acts as the natural pacemaker of the heart, initiating the electrical impulse. An artificial pacemaker is implanted to replace this function when the SA node fails.

Multiple choice

Avian heart is a __________.

  1. two - chambered

  2. four - chambered

  3. three - chambered

  4. five - chambered
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Birds (Aves) have a highly efficient circulatory system with a four-chambered heart, which completely separates oxygenated and deoxygenated blood.