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

Pulmonary artery carries _______.

  1. oxygenated blood to lungs

  2. deoxygenated blood to heart

  3. deoxygenated blood to lungs

  4. oxygenated blood to heart

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

Unlike most arteries, the pulmonary artery carries deoxygenated blood. It transports this blood from the right ventricle of the heart to the lungs for oxygenation.

Multiple choice

______ is a type of blood vessel in human body.

  1. Capillary

  2. Xylem

  3. Phloem

  4. Spleen

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

Capillaries are the smallest blood vessels where the exchange of gases, nutrients, and wastes occurs between blood and tissues. Xylem and phloem are plant tissues, and the spleen is an organ, not a vessel.

Multiple choice

Which artery carries deoxygenated blood?

  1. Coronary artery

  2. Intercostal artery

  3. Branchial artery

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

The basic function of pulmonary artery is to carry deoxygenated blood from the heart’s right ventricle into the lungs.

Multiple choice

Which coat of artery prevents it from collapsing?

  1. Tunica interna

  2. Tunica media

  3. Tunica externa

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

It prevents the artery from collapsing. It is the middle thick coat of circularly disposed, smooth or unstriped muscle fibres and elastic connective fibres. The thick coat prevents arteries from collapsing.

Multiple choice

What is stroke volume?

  1. The volume of blood entering into the auricles at each heart beat

  2. The volume of blood ventricles pump at each heart beat

  3. The volume of blood pumped daily by heart

  4. The volume of blood pumped by heart per minute
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At each heart beat ventricles pump about 70 ml of blood. This volume is called stroke volume.

Multiple choice

Starting from deoxygenated blood, what is the course of blood flow in the heart?

Note: RA (right auricle), RV (right ventricle), LA (left auricle) and LV (left ventricle)

  1. LV - LA - RV - RA

  2. RA - RV - LA - LV

  3. RA - LA - LV - RV

  4. LV - RV - RA - LA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the right course. RA receives deoxygenated from body. Deoxygenated blood then passes to RV from where it goes to the lungs for oxygenation. The oxygenated blood comes to LA from the lungs, from where it goes to LV to be supplied to the whole body.

Multiple choice

What is the function of semilunar valves?

  1. Pumping of blood

  2. Preventing the backflow of blood from the arteries to the ventricles

  3. Bringing deoxygenated blood to heart

  4. Distributing oxygenated blood to the body
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Semilunar valves prevent the backflow of blood from the arteries to the ventricles.

Multiple choice

Which organ circulates the blood?

  1. Kidney

  2. Heart

  3. Brain

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

The heart is the muscular organ responsible for pumping blood throughout the circulatory system to deliver oxygen and nutrients to tissues.