Biology · General Awareness

Human Circulatory System

846 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

Below are some right arm conditions.  Which is okay to take blood pressure on right arm?

  1. paralyzed right arm

  2. IV in right arm

  3. tattoo on right arm<span id="_wysihtml5-undo" class="_wysihtml5-temp">

  4. right arm pain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A tattoo on the right arm does not interfere with blood pressure measurement. Contraindications include paralysis, IV lines, mastectomy, dialysis access, or pain in that arm. The unaffected arm should be used.

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 biology human system human lymphatic system lymph and its function lymph and tissue fluid

In which organ the blood is stored?

  1. Spleen

  2. Liver

  3. Kidney

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

Essentially, the spleen is a storage container and filter for blood, though it is part of the lymphatic system. In fact, it’s the largest lymph node in the body. One of its tasks is to remove harmful bacteria and viruses in the blood stream. Its other major task is removing or storing certain blood cells. The spleen is composed of two primary regions namely, red pulp and white pulp. The red pulp makes up for little more than three-fourth of the spleen. A region designated marginal zone is a transition area that separates it from the white pulp. Red pulp is red because it has many small cavities (sinusoids) where the spleen stores blood in case of injury or other situations where the body needs extra blood. This blood reserve has a high count of platelets, an essential component for blood coagulation to help stop bleeding. In liver, kidney and heart blood can not be stored. Thus, option A is correct.

Multiple choice

Which is a portal of entry?

  1. Blood

  2. Skin lesions

  3. Blood vessels

  4. Respiratory secretions
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A portal of entry is the site through which a pathogen enters the host. Blood vessels provide a direct route into the systemic circulation for many pathogens, making them a critical portal of entry.

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.