Biology · General Awareness

Human Circulatory System

818 Questions

The human circulatory system explores the network of blood vessels, heart valves, and structural pathways. Test items often target blood flow sequences and specific vascular functions. Mastering these details is vital for biology preparation.

Heart valves and chambersBlood vessels and venulesArteries of the bodyBlood supply to organsCentral nervous system supply

Human Circulatory System Questions

Multiple choice

blood is carried to the heart via

  1. veins

  2. arteries

  3. dilated vessels<span id="_wysihtml5-undo" class="_wysihtml5-temp">

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

Veins carry blood back to the heart. They have thinner walls and valves to prevent backflow. Arteries carry blood away from the heart. Capillaries are tiny exchange vessels.

Multiple choice

In which vessel should you measure a pulse?

  1. Vein

  2. Capillary

  3. Arteriole

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

A pulse is the rhythmic expansion and recoil of an artery due to the heart's contraction. Veins and capillaries do not exhibit this pressure wave.

Multiple choice

Which is NOT true about the human heart?

  1. The right side is deoxygenated

  2. It has four chambers

  3. valves keep blood flowing in the right direction

  4. It is made of smooth muscle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The heart is composed of cardiac muscle, not smooth muscle. Smooth muscle is found in organs like the stomach and blood vessels.

Multiple choice

Which is the term give to circulation between the heart and lungs?

  1. Coronary Circulation

  2. Systemic Circulation

  3. Lymphatic Circulation

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

Pulmonary circulation refers to the loop between the heart and the lungs. Systemic circulation covers the rest of the body, and coronary circulation supplies the heart muscle.

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Which of the following is TRUE regarding atrial natriuretic factor (ANF)?

  1. When blood pressure is increased, ANF is secreted which causes dilation of the blood vessels

  2. ANF is a peptide hormone

  3. ANF is secreted by the atrial wall of the heart

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the blood pressure is increased it results in excess of blood flow to the Heart. When the blood flow to the heart is increased it leads to the stretching of the atrial wall and the release of ANF (Atrial natriuretic polypeptide) from the atrial walls. The ANF is a polypeptide hormone which causes the vasodilation (dilation of blood vessels) and thereby decrease the blood pressure. Hence ANF is a peptide hormone which is secreted by the atrial wall of the heart when blood pressure is increased and causes dilation of the blood vessels which results in the decrease of the blood pressure.

So, the correct option is 'All the above'.

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

Blood pressure is defined as the force with which blood

  1. Comes out of the atrium

  2. Is pushed to the legs

  3. Pushes against wall of blood vessels

  4. Comes out of the ventricle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The force with which the blood pushes against the walls of the blood vessels, usually arteries, is known as the blood pressure. It is described in the unit mm Hg. The normal diastolic and systolic pressure of the adult human heart is 120 mm Hg and 80 mm Hg, respectively.

Thus, the correct answer is 'Pushes against wall of blood vessels.'

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

What is blood pressure?

  1. The pressure of blood on the heart muscle

  2. The pressure of blood exerted on the walls of arteries and veins

  3. The pressure of blood on the walls of veins only

  4. The pressure of blood on the walls of arteries only
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The blood flows under great pressure in the arteries and veins. Blood pressure may be defined as the pressure exerted by the blood on the arteries and veins. It is measured by sphygmomanometer.

So, the correct answer is option B.

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

Blood pressure in the pulmonary artery is

  1. Less than that in venae cavae

  2. Same as that in aorta

  3. More than that in carotid

  4. More than that in pulmonary vein.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pulmonary artery carries deoxygenated blood from the heart to the lungs. Its pressure is higher than that of the pulmonary vein, which carries oxygenated blood back to the heart at a much lower pressure.

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

Contraction drives blood through the pulmonary circuit and the systemic circuit; blood  pressure is highest in contracting 

  1. atrial; ventricles

  2. ventricular; arteries

  3. atrial; atria

  4. ventricular; ventricles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ejection of blood into the arteries causes the pressure within the arteries to rise, so the ventricular blood pressure is the highest in contracting arteries.

So, the correct option is 'ventricular; arteries'.

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

Atrial natriuretic factor-

  1. increases blood pressure

  2. decreases blood pressure
  3. increases absorption of $Na^+$

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

The atrial natriuretic hormone (ANP) is a cardiac hormone in which gene and receptors are widely present in the body. Its main function is to lower blood pressure and to control electrolyte homeostasis. So the correct option is 'Increase blood pressure'.

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

Consider the following statements regarding blood pressure.
1. It is the pressure exerted by the blood on the walls of any blood vessel.
2. It decreases in the arteries as the distance from the heart increases.
3. It is lower in the capillaries than in the arteries.
4. It is usually lower in women than in men.

  1. 1 and 4 are correct.

  2. 2, 3 and 4 are correct.

  3. 1 and 3 are correct.

  4. 1, 2, 3 and 4 are correct.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood pressure (BP) is the pressure exerted by circulating blood upon the walls of blood vessels. It is usually measured at a person's upper arm. Blood pressure is usually expressed in terms of the systolic (maximum) pressure over diastolic (minimum) pressure and is measured in millimeters of mercury (mm Hg). It is one of the vital signs along with respiratory rate, heart rate, oxygen saturation, and body temperature. Normal resting blood pressure in an adult is approximately 120/80 mm Hg.

It decreases in the arteries as the distance from the heart increases.
It is lower in the capillaries than in the arteries.
It is usually lower in women than in men.

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

Systole brings about the

  1. Entry of blood into lungs

  2. Entry of blood into heart

  3. Exit of blood from lungs

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

Systole refer to the contraction phase of the cardiac cycle of the heart between the first and second heart sounds of the cardiac cycle. Systole causes the contraction of the ventricles of the heart leading to ejection of blood into the aorta and pulmonary trunk.
Therefore, the correct answer is option D.

Multiple choice biology human body and organ system blood pressure circulatory system transportation in animal and plants

Blood pressure in the veins is lower than that of arteries. The best hypothesis to explain this is that 

  1. Capillaries offer resistance to the blood flow

  2. Veins are farther from the heart

  3. Most veins carry blood up-hill

  4. Veins have thinner walls than arteries
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The arteries carry blood away from the heart, while veins return blood to the heart. With both, their structure is related to their function. Blood in the arteries is under high pressure generated by the heart. The arteries have thick outer walls and thick layers of muscle and elastic fibers. The blood in veins is under lower pressure than the blood in arteries. The veins have thin walls and thin layers of muscle and elastic fibers. Unlike arteries, veins have one-way valves in them to keep the blood moving in the correct direction.

So, the correct answer is option B.