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Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - NEET MCQ


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15 Questions MCQ Test - Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26)

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Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 1

Select the favorable conditions required for the formation of oxyhemoglobin at the alveoli.      [2021]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 1

In the alveoli, where there is high pO2, low pCO2, lesser H+ concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin, whereas in the tissues, where low pO2, high pCO2, high H+ concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 2

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his expiratory capacity if the residual volume is 1200 mL?    [2019]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 2

Expiratory capacity is the total volume of air a person can expire after normal inspiration. It includes tidal volume and expiratory reserve volume.
EC = TV + ERV = 500 + 1000 = 1500 mL

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Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 3

The alveolar epithelium in the lungs is[1990]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 3

The very thin alveolar wall (about 0.0001 mm) is composed of moist, nonciliated, squamous epithelial cells.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 4

Oxygen dissociation curve of haemoglobin is[1994]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 4

It is the relationship between the percentage saturation of haemoglobin (by volume) in the blood and the oxygen tension (in partial tension) PO2 of the blood.
It is usually a sigmoid plot. Haemoglobin molecules can bind up to four oxygen molecules in a reversible way. The shape of the curve results from the interaction of bound oxygen molecules with incoming molecules. The binding of the first molecule is difficult. However, this facilitates the binding of the second and third molecules, and it is only when the fourth molecule is to be bound that the difficulty increases, partly as a result of crowding of the haemoglobin molecule, partly as a natural tendency of oxygen to dissociate.

The O2-Hb dissociation curve is a sigmoidal curve that represents the relationship between O2 concentration and the percentage saturation of Hb. As the concentration increases from about 90% there is a significant plateau in the curve, which has several important biological repercussions.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 5

The carbon dioxide is transported via blood to lungs as [1995]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 5

Carbon dioxide is transported via blood to lungs mostly as carbaminohaemoglobin and carbonic acid. It is released in lungs in exchange with oxygen.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 6

The quantity 1200 ml in the respiratory volumes of a normal human adult refers to [1996]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 6

The total volume of air that can be expelled from the lungs after maximum inspiration and then expiring to the maximum is known as the vital capacity. The volume of air that remains inside lungs at the end of maximum forceful expiration is the residual volume. Expiratory reserve volume is the maximum extra volume of air that can be expired by forceful expiration after a normal tidal expiration. Total lung capacity is the maximum volume of air that can be contained in the lungs after maximum inspiration.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 7

The exchange of gases in the alveoli of the lungs takes place by [1998]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 7

Gaseous exchange between blood (dissolved phase) and alveolar air (gaseous phase) across respiratory membrane occurs by simple diffusion. Obviously, it depends upon the concentration gradient (=partial pressure) of the concerned gases in blood and alveolar air.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 8

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?    [2021]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 8

Fibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 9

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of the ventricular systole is 50 mL?    [2019]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 9

Stroke volume = End diastolic volume - End systolic volume
= 100 - 50 = 50 mL
Cardiac output = Heart beat x stroke volume
∴ Heart beat = Cardiac output/Stroke volume = 5000 / 50 = 100 beats per minute

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 10

Which one of the following blood cells is involved in antibody production.

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 10

B-lymphocytes cells are involved in antibody production.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 11

Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as [2011M]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 11

70% to 75% CO2 is transported as primary buffer of the blood. Bicarbonate ion (HCO3) in blood plasma. When CO2 diffuses from tissues into blood then it is acted upon by the enzyme carbonic anhydrase.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 12

Arteries are best defined as the vessels which : [2011]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 12

Arteries are best defined as the vessels which break up into capillaries which reunite to form a vein.
Arteries are the blood vessels which carry oxygenated blood from the heart to the organs. It breaks up into several branches of capillaries before entering the organs. These capillaries again reunite to form venules and ultimately veins which carry the deoxygenated blood towards the heart. 

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 13

The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function? [2011]

Options : 

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 13

In the given figure the exchange of respiratory gases occurs in alveolar cavity.

The pulmonary alveoli are the terminal ends of the respiratory tree, which are the gas exchange sites. The alveolar membrane is the gas exchange surface. Carbon dioxide rich blood is pumped from the rest of the body into the alveolar blood vessels where, through diffusion, it releases its carbon dioxide and absorbs oxygen.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 14

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

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 14

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.

Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 15

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having: [2009]

Detailed Solution for Test: Breathing and Exchange of Gases & Body Fluids and Circulation (August 26) - Question 15

The ABO blood group system is the most important blood type system (or blood group system) in human blood transfusion. It is named ABO and not ABC, because blood group O (or blood group zero in some countries) individuals do not have either A or B antigens on the surface of their RBCs, but their blood serum contains IgM anti-A antibodies and anti-B antibodies against the A and B blood group antigens. Therefore, a group O  individual can receive blood only from a group O individual, but can donate blood to individuals of any ABO blood group (ie A, B, O or AB).

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