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

Lymph drains excess fluid from extracellular space back into

  1. Blood

  2. Lymph node

  3. Lymphatic channel

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

Lymph is a colourless fluid and connective tissue. It carries an excess of the extracellular fluid back to the venous system or it absorbs the excess fluid from the tissue and to return it to the blood. Lymphatic capillaries join and form lymphatic vessels further it forms lymphatic ducts. It is of two types: thoracic duct and right lymphatic duct. A small bean- shaped lymphoid organ surrounded by fibrous connective tissue carries fluid, nutrients & waste material between the body are lymph nodes or lymph glands.

Thus, the correct answer is A.

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

Which of the following is blood bank of the body or reservoir, where the blood is stored and can be mobilized?

  1. Heart

  2. Liver

  3. Bone marrow

  4. Spleen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The spleen is an organ in the upper far left part of the abdomen, to the left of the stomach. It’s commonly fist-shaped, purple, and about 4 inches long.
It is known as the blood bank because its blood reserve can be valuable in case of hemorrhagic shocks. 
It acts as a filter for blood as part of the immune system. Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen also helps fight certain kinds of bacteria that cause pneumonia and meningitis. Hence, the correct answer is option D.
Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Which organ receives only oxygenated blood?

  1. Gill

  2. Spleen

  3. Lung

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

The splenic artery branches off from the aorta and the celiac trunk to deliver oxygenated blood to the spleen, while the splenic vein carries deoxygenated blood away from the spleen to the hepatic portal vein. 

Therefore, the correct answer is option B.

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

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
C Correct answer
Explanation

In Coronary Artery Bypass Grafting (CABG), surgeons can use either healthy blood vessels harvested from other parts of the patient's body, such as the saphenous vein from the leg or the internal thoracic (mammary) artery from the chest wall, to bypass the blocked coronary arteries.

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

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'.