An adult human with average health has systolic and diastolic pressures as

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An adult human with average health has systolic and diastolic pressures as 120 mm Hg and 80 mm Hg respectively.

Congestion of lungs is one of the main symptoms of ____.

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Congestion of lungs is one of the main symptoms of heart failure.

____ is referred to as atherosclerosis.

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Coronary artery disease is often referred to as atherosclerosis.

Arteries are best defined as the vessels which:

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Arteries are the vessels which break up into capillaries which reunite to form one visceral organ.

In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?

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In a standard ECG, the P-wave is a small upward wave that indicates the depolarisation of the atria. This is caused by the activation of SA node.

Antibodies are

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Antibodies are immunoglobulins (Igs) which are produced in response to antigenic stimulation.

The thickening and loss of elasticity of arterial wall are called

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The thickening and loss of elasticity of arterial wall are called arteriosclerosis.

The pH of blood is

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Blood is an opaque, mobile connective tissue fluid which has salty taste. pH of blood is between 7-8. Hence, the blood possesses slightly alkaline pH.

____ regulates the normal activities of the heart.

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Normal activities of the heart are auto regulated by a specialized muscle fibre called nodal tissue.located in the wall of the right atrium of the heart, that receives electrical impulses from the sinoatrial node and directs them to the conduction system in the walls of the ventricles.Also called A-V node.

Which of the following is not the function of lymph glands?

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Lymph is described as blood minus RBC. It plays an important role in defence against microbes, forms WBC but it does not form erythrocytes or RBCs.

At high altitude, the RBCs in human blood

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At high altitude, the RBCs in human body increase due to low atmospheric pressure and low oxygen count.

Which one of the components of ECG in human is correctly interpreted below?

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P- wave represent depolarisation of the atria. Complex QRS represents depolarisation of ventricles. There is one ventricular contraction during one heart beat. So,option A is correct.

The oxygenated blood from the heart is pumped into the ____.

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The left ventricle pumps the oxygenated blood from the heart into the aorta.

The name of disease connected with Rh factor is

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Erythroblastosis is the disease related with Rh-factor. It occurs in the foetus due to Rh incompatibility between the mother and the fetus.

The enzyme ____ converts the inactive fibrinogens to fibrins.

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The enzyme thrombin converts the inactive fibrinogens to fibrins. Enzyme thrombokinase converts inactive prothrombin into active thrombin.

Blood from the pulmonary vena cava flows into the ____.

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The blood from the pulmonary vena cava flows into the left atrium.

Blood doesn’t clot in the absence of ____ ions.

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Calcium ions play a very important role in clotting.

____ is the most common blood group.

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O positive blood group is the most common blood group.

Heparin is connected with

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Heparin is an anticoagulant secreted by basophilic type of granulocyte (WBC). It is formed in liver by mast cells.

Which one of the following is a matching pair?

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Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole.

A person who is of ____ blood group will NOT have either anti-A or anti-B antibodies in the blood.

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People with AB blood group normally do not have either of the antibodies (anti-A or anti-B).

Humoral immune system comprises of

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Humoral/antibody mediated immune system comprises of 'B' and 'T' lymphocytes.

When the ventricles are in diastole ____ valves close rapidly.

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When the ventricles are in diastole, semilunar valves close rapidly. The pressure in the ventricles decreases than in the great arteries, when the ventricles are in diastole. So to prevent the backward flow of blood when the ventricles are in diastole, the semilunar valves close rapidly.

Pacemaker of heart is

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Sino-Atrial node (SA node) present in the walls of right atrium has a myogenic initiation of heartbeat in a regular fashion and controls the pace of heartbeat called pacemaker.

A person of blood group A can receive blood from ____.

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person with blood group A has anti-B antibodies, he/she can receive blood only from A and O blood group donors, not from B or AB.

The dub sound is associated with the ____.

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The dub sound is associated with the closure of the semilunar valves. The lub sound is associated with the closure of the tricuspid and bicuspid valves.

Antigens are present

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Antigens are foreign proteins, which stimulate specific immune response (antibody) against itself when introduced into the body. They are present on the surface of cell wall.

During blood clotting, the platelets release

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During injury platelets release a number of platelet factors and an enzyme, thromboplastin which result in the coagulation of blood and clot formation that prevents excessive bleeding.

Inter-atrial septum separates the ____.

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Inter-atrial septum separates the right and left atria.

Antibodies required for fighting toxins & pathogens are usually produced by

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Lymphocytes are the types of WBCs that help in producing antibodies to fight the antigens or toxins produced by germs.

Class 11th Biology - 18 Body Fluids and Circulation MCQs
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Class 11th Biology - 18 Body Fluids and Circulation MCQs