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 blood clotting and healing of wounds coagulation of blood blood clotting

Blood clot formed in vessels blocking the flow of the blood is called as the

  1. Bolus

  2. Pus

  3. Ulcer

  4. Thrombus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A thrombus is a blood clot that forms in a vessel and remains there. Clot leads to the coagulation of particles forming a thickened mass. It is traveled from the site of its production to another location in the body. It can block the flow of blood in that location depriving tissues of normal blood flow and oxygen. This can result in damage, destruction (infarction), or even death of the tissues (necrosis) in that area. 
Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

A drop of each of the following, is placed separately on four slides. Which one of them will not coagulate?

  1. Blood serum

  2. Sample from thoracic duct of lymphatic system

  3. Whole blood from pulmonary vein

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

Blood serum is the component of blood that has neither a blood cell nor a clotting factor. Serum includes all proteins not used in blood clotting (coagulation) and all the electrolytes, antibodies, antigens, hormones, and any exogenous substances (e.g., drugs and microorganisms). Hence, serum does not clot. Thus, the correct answer is option A.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

The blood does not clot inside the body because of 

  1. Oxygenation of blood

  2. Movement of blood

  3. Absence of active clotting factors in normal condition

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In blood, platelets produce thromboplastin only at the site of injury and not in the normal condition which initiates the process of blood clotting. There is an another factor or protein called fibrinogen. When it makes contact with oxygen, it polymerizes to fibrin wires, creating a heap of fibrin wires, in which the various blood cells get caught, thus clogging the wound. Because all the oxygen in the blood is already bound to haemoglobin (red cells), it can't interact with the fibrinogen, thus cannot create a clot. Thus, the correct answer is option C.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Coagulation of blood in vessels is prevented during normal circulation by

  1. Heparin

  2. Prothrombin

  3. Plasminogen

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

Heparin is a natural anticoagulant of the body produced in the liver. It is normally found circulating through the bloodstream. It prevents the blood clotting in veins and arteries during normal circulation.

Thus, the correct answer is option A.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Blood clot inside a blood vessel is known as  

  1. Thrombosis

  2. Agglutinin

  3. Clot

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

A blood clot that forms inside one of your veins or arteries is called a thrombus. A thrombus may also form in your heart. A thrombus that breaks loose and travels from one location in the body to another is called an embolus.

So, the correct option is 'Thrombus'.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

What happens when a clot occurs in an undamaged blood vessel?

  1. The person would bleed to death.

  2. A scab will form on the skin surface.

  3. Platelets stick to the edges of the cut and to one another, forming a plug.

  4. The flow of blood to tissues beyond the clot may be cut off.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a clot occurs in an undamaged blood vessel, It stops the flow of blood to the rest of the tissue beyond the clot as, the blood can't flow through the clot. It causes paralysis in most of the cases. 

Therefore, the correct answer is option D.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Blood does not clot inside the blood vessels due to the presence of

  1. Heparin

  2. Fibrinogen

  3. Vitamin K

  4. Thrombin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Liver produces an anticoagulant, hetero-polysaccharide called heparin which prevent clotting inside the blood vessels. Heparin is a highly sulfated glycosaminoglycan and is also used to form an inner anticoagulant surface on experimental and medical devices.
Fibrinogen is a glycoprotein that helps in the formation of blood clots.
Thrombin is a blood coagulation factor.
Thus, the correct answer is option A. 
Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

A drop of each of the following, is placed separately on four slides. Which of them will not coagulate?

  1. Blood plasma

  2. Blood serum

  3. Sample from the thoracic duct of lymphatic system

  4. Whole blood from pulmonary vein
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coagulation is the process by which the blood changes from a liquid to a gel-like form. Blood plasma will coagulate, as, it has clotting factors in it and fibrinogen protein.
Serum will not coagulate, as, it do not have any clotting factors and fibrinogen.
Lymph is more like blood plasma, so, contains clotting factors and will coagulate.
Whole blood obviously coagulate for containing the same above factors.
Thus, the correct answer is option (B).

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Find the correct explanations about blood not clotting inside the vessels
1. Speedy flow prevents accumulation of fibrin threads if formed
2. Absence of anticoagulant heparin having antithrombin activity
3. Smoothness of endothelial lining preventing rupturing of platelets and formation of thromboplastin
4. Presence of a layer of negetively charged protein over the inner surface of endothelium that attracts clotting factors.

  1. 1, 2, 3 correct

  2. 1, 2 correct

  3. 2, 4 correct

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

Blood does not clot inside vessels due to the smooth endothelial lining (preventing platelet rupture) and the rapid flow of blood (preventing the accumulation of clotting factors). Heparin is present as a natural anticoagulant, and the endothelium is negatively charged to repel platelets.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

The blood does not clot inside the body because of

  1. Oxygenation of blood

  2. Movement of blood

  3. Heparin in blood

  4. Absence of fibrinogen in blood
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A blood clot is actually the thickened mass formed by the blood platelets and stops the blood profusely out of any cuts or wounds. However, in general and in healthy condition blood does not form clots inside the body due to the presence of heparin an anticoagulant that is secreted by the basophils and mast  cells of the blood. Since, this is released into the blood vessels it prevents the formation of clots in them
So, the correct answer is 'Heparin in blood'
Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Fill in the blanks with suitable words given below:
The liquid part of coagulated blood is known as _________

  1. Serum

  2. Fibrinogen

  3. Hemoglobin

  4. Pulmonary

  5. Sphygmomanometer

  6. Ventricles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The liquid part of coagulated blood is known as serum. It is the liquid portion of blood clot . It includes all proteins not used in clotting of blood and all the electrolytes, hormones, antibodies, antigens etc..

Hence, the correct answer is 'Serum' .

Multiple choice evs communicable diseases infectious diseases - transmission and prevention infectious diseases and how to prevent them pathogen and their mode of transmission

After cobra bite, venom affects the

  1. Brain

  2. Blood circulation

  3. Lungs

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cobras belong to the elapids sub-group of snakes and there

are over 270 species of cobras. Cobra's venom

contains postsynaptic neurotoxins that spread rapidly into the victim's

bloodstream and affects the lungs causing respiratory failure and eventually, death.