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

Cardiac muscles are

  1. involuntary

  2. voluntary

  3. only present in heart

  4. both (1) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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Multiple choice

Which of the following is the correct statement?

  1. All arteries carry oxygenated blood.

  2. An adult human has systolic and diastolic pressures as 80 mm Hg and 120 mm Hg respectively.

  3. Bundle of His is a network of muscle fibres distributed throughout the heart walls.

  4. Cardiac output is defined as the amount of blood pumped by both ventricles per second.

  5. Average cardiac output is 5.3 litre per minute.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Correct statement. Average cardiac output is 5.3 litre per minute.

Multiple choice

When a person is resting and feels relaxed, which among the following systems is responsible for the constriction of the pupil and the slowing of the heart beats?

  1. Peripheral nervous system

  2. Central nervous system

  3. Sympathetic nervous system

  4. Parasympathetic nervous system

  5. Visceral sensation system
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the stress subsides, the parasympathetic nervous system of the body produces opposite effects of sympathetic nervous system. It conserves energy as it calms an individual by decreasing heartbeat, lowering blood sugar, and so forth.

Multiple choice

Consider the following statements:

1.         Unlike mammals, the heart of fish has 2 chambers and that of reptile has 3 chambers. 2.         Epicardium, micocardium and endocardium are the three wall layers of human heart. 3.         Pericardial is the fluid present in the protective sac of the human heart.

Which of the statements given above are correct?

  1. 1 and 2 only

  2. 1 and 3 only

  3. 2 and 3 only

  4. 1, 2 and 3

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1: It is correct. In case of humans, other mammals and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right ventricles. Fish, in contrast, have two chambers, an atrium and a ventricle, while reptiles have three chambers. Statement 2: It is incorrect. In a healthy heart, blood flows one way through the heart due to heart valves which prevent backflow. The heart is enclosed in a protective sac, the pericardium which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium. Statement 3: It is correct. Pericardial fluid is the serous fluid secreted by the serous layer of the pericardium into the pericardial cavity. The fluid is similar to the cerebrospinal fluid of the brain which also serves to cushion and allow some movement of the organ. Hence, the correct option is 2.

Multiple choice physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

Echocardiography is used to diagnose heart diseases which utilises infrasonic waves.

  1. True

  2. False

  3. Ambiguous

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

An echocardiogram (also called an echo) is a type of ultrasound test that uses high-pitched sound waves that are sent through a device called a transducer. The device picks up echoes of the sound waves as they bounce off the different parts of your heart. These echoes are turned into moving pictures of your heart that can be seen on a video screen.
Hence, the statement is false.

Multiple choice

What is the average heart rate of a hummingbird?

  1. 1260 beats per min

  2. 600 beats per minute

  3. 240 beats per min

  4. 170 beats per minute
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hummingbirds have extremely high metabolic rates, which requires a very fast heart rate. Their heart rate can reach up to 1,260 beats per minute during flight.

Multiple choice zoology nervous system of man pns divisions of nervous system peripheral nervous system

Para synthetic Nervous System.

  1. Increases heart beat

  2. Decreases heart beat

  3. Originates heart beat

  4. Has no effect upon heart beat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate. At the beginning of exercise, your body removes theparasympathetic stimulation, which enables the heart rate to gradually increase.
So the, the correct option is 'Decreases heart beat'.
Multiple choice hepatic portal system components of the circulatory system transport in animals the circulatory system biology

Artificial pacemaker is implanted subcutaneously for correcting

  1. 90% blockage of coronary arteries

  2. High blood pressure

  3. Arteriosclerosis

  4. Irregularity of heart rhythm.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An artificial pacemaker is a medical device used to regulate the heart's electrical impulses, specifically treating conditions like bradycardia or heart block where the heart rhythm is irregular or too slow.