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 biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Splenic artery arises from 

  1. Anterior mesenteric artery

  2. Coeliac artery

  3. Posterior mesenteric artery

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

The splenic artery supplying the organ spleen is the branch of the coeliac artery which itself is a branch of the abdominal aorta. The abdominal aorta is a branch of dorsal aorta/systemic aorta.

Dorsal aorta > Abdominal segmental aorta > Coeliac artery > Splenic artery.
So, the correct answer to the question is 'Coeliac artery'.

Multiple choice biology body fluids and circulation cardiac disorders cardiac regulation and disorders the blood system

Increase in blood pressure is

  1. Arteriosclerosis

  2. Atherosclerosis

  3. Hypertension

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Hypertension is a condition in which blood pressure increases above systolic pressure (140 mm Hg) and diastolic pressure (90 mm Hg). This condition is also known as high blood pressure. It occurs due to emotional  stress and nervous tension that leads to contraction of arteries. It is one of the major causes of heart failure and stroke. Due to hypertension, the arteries of kidneys may get damaged and this causes chronic nephritis. 
So, the correct answer is 'Hypertension'.
Multiple choice biology blood circulatory system of human cardiac disorders cardiac regulation and disorders the blood system

Atherosclerosis refers to the ailment of

  1. Lungs

  2. Heart

  3. Kidney

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

Atherosclerosis is a disease condition of the arteries, where the lumen of the arteries gets narrow because of deposition of lipids in the endothelial and mesothelial layers of the blood vessel. Prolonged deposition of lipids leads to hardening of the walls of these arteries and blood flow through the arteries is reduced. Thus, the correct answer is option B.

Multiple choice biology blood circulatory system of human cardiac disorders cardiac regulation and disorders the blood system

In Coronary Artery Bypass Grafting (CABG), in order to bypass the blocked region of the coronary artery surgeon uses?

  1. Only arteries from another part of body

  2. Only veins from another part of body

  3. Artery or a vein from another part of body

  4. Only artificial arteries made from porous plastic fibres of dacron or teflon
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology blood circulatory system of human cardiac disorders cardiac regulation and disorders the blood system

Consider the following statements about biomedical technologies.

A. During open heart surgery, blood is circulated in the heart lung machine.
B. Blockage in coronary arteries is removed by angiography.
C. Computerised Axial Tomography (CAT) shows detailed internal structure as seen in a section of body.
D. X-ray provides clear and detailed images of organs like prostate glands and lungs.

Which two of the above statements are correct?

  1. A and C

  2. A and B

  3. B and D

  4. C and D
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cardiopulmonary bypass (CPB) is a technique that temporarily takes over the function of the heart and lungs during surgery, maintaining the circulation of blood and the oxygen content of the body. The CPB pump itself is often referred to as a heartlung machine or "the pump". A CT or CAT scan is a diagnostic imaging procedure that uses a combination of X-rays and computer technology to produce horizontal, or axial, images (often called slices) of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, organs, and blood vessels. CT scans are more detailed than standard X-rays.

Multiple choice biology blood circulatory system of human cardiac disorders cardiac regulation and disorders the blood system

The thickening of walls of arteries is called

  1. Aneurysm

  2. Arteriosclerosis

  3. Arthritis

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Arteriosclerosis, thickening and hardening of the arteries, is a condition in which plaque builds up inside the arteries. Plaque is made of cholesterol, fatty substances, cellular waste products, calcium and fibrin (a clotting material in the blood). Atherosclerosis is a type of arteriosclerosis. Arteriosclerosis is a general term for the thickening and hardening of arteries.  

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

In which of the following points pulmonary artery is different from pulmonary vein?

  1. Its lumen is broad.

  2. Its wall is thick.

  3. It has valves.

  4. It does not possess endothelium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The pulmonary artery carries deoxygenated blood from the heart to the lungs while the pulmonary vein carries oxygenated blood from the lungs to the heart. A pulmonary artery has a smaller lumen and thicker walls as compared to a pulmonary vein.
Thus, the correct answer is 'Its wall is thick.'
Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Given below are four statements (i-iv) regarding human blood circulatory system.
i. Arteries are thick-walled and have narrow lumen as compared to veins.
ii. Angina is acute chest pain when the blood circulation to the brain is reduced.
iii. Persons with blood group AB can donate blood to. any person with any blood group under ABO system.
iv. Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?

  1. i and iv

  2. i and ii

  3. ii and iii

  4. iii and iv
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

i. Arteries have thick, elastic walls and narrow lumen while veins have thinner, scarcely elastic walls and wide lumen.

ii. Angina Pectoris is a pain in the chest due to deprived oxygen the heart muscle experience constricting pain. This is not a fatal condition and the pain passes off quickly.
iii. Persons with blood group AB is a universal recipients. It has both the antigens A and B but no bodies.
iv.  During clot, Thromboplastin helps in the formation of an enzyme prothrombinase. This enzyme inactivates heparin and it also converts the inactive plasma protein prothrombin into its active form, thrombin. Both changes require calcium ions.
So, the correct answer is 'i and iv'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Which of the following statements is incorrect?

  1. Veins are typically larger in diameter than arteries.

  2. Because of their small size, blood flows more rapidly in capillaries than in other parts of circulatory system.

  3. Walls of arteries are elastic enabling them to stretch and shrink during changes in blood pressure.

  4. Veins contain more blood than any other part of circulatory system.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A. Arteries have thick, elastic walls and narrow lumen while veins have thinner, scarcely elastic walls and wide lumen.

B. Arteries branch out into smaller and thinner blood vessels called arterioles. these divide into still smaller vessels to provide blood to all the cells. The thinnest blood vessels are called capillaries. The flow of blood is very slow in capillaries.
C. The walls of arteries are a muscular and elastic coat. It consists of unstriated muscle fibres with some yellow elastic fibres are arranged in a circular manner. It holds the blood vessel open. This layer determines the amount of supply of blood to an organ and it maintains the blood pressure.
D. Veins bring back blood from the tissues and organs to the heart. The blood in veins flows under less pressure than that in arteries. Therefore, veins can accommodate more blood.
So, the correct answer is 'Because of their small size, blood flows rapidly in capillaries than in other parts of circulatory system'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Splenic artery arises from?

  1. Anterior mesenteric artery

  2. Coeliac artery

  3. Posterior mesenteric artery

  4. Intestinal artery
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The splenic artery  is the blood vessel that supplies oxygenated blood to the spleen. It branches from the celiac artery, and follows a course superior to the pancreas. It supplies oxygenated blood to the arteries.
So, the correct option is 'Coeliac artery'.
Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

In mammals, veins differ from arteries in having

  1. Thicker walls

  2. Deeply present

  3. Carry blood away from heart

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

Veins carry deoxygenated blood (with the exception of pulmonary veins and umbilical vein) from different parts of the body to the heart. They have thin, elastic muscle layer with semilunar valves that prevent the blood from flowing in the opposite direction. 

So, the correct answer is option D.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

The vein that does not directly open into the heart is:

  1. Pulmonary vein

  2. postcaval vein

  3. Precaval vein

  4. Posterior mesentric vein
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • The pulmonary vein opens directly into the left atrium while postcaval and precaval veins into the right atrium.
  • The posterior mesenteric vein is a blood vessel that drains blood from the small intestine (jejunum and ileum). At its termination behind the neck of the pancreas, it combines with the splenic vein to form the hepatic portal vein and hence does not open into the heart.
So, the correct option is 'Posterior mesenteric vein'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Arteries carry oxygenated blood,except

  1. Coronary artery

  2. Hepatic artery

  3. Aorta

  4. Pulmonary artery
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well).

So, the correct answer is 'Pulmonary artery'.
Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

State the true statements of the following:
$(1)$ Flowing blood in arteries is without high pressure.
$(2)$ Blood flowing in veins is without pressure.
$(3)$ Veins have valves opening towards heart.
$(4)$ Arteries have valves opening towards heart.

  1. $1$ and $3$ statements are true
  2. $1$ and $4$ statements are true
  3. $2$ and $3$ statements are true
  4. $1$ and $4$ statements are true
Reveal answer Fill a bubble to check yourself
A Correct answer