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4

Emphysema is a respiratory disease in which

A. the larynx is closed

B. the trachea gets narrowed

C. the gas exchange area of lungs is increased

D. the gas exchange area of lungs is decreased

Correct Answer :

D. the gas exchange area of lungs is decreased


Related Questions

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The medullary inspiratory centre is always under direct control of

A. chemicals

B. physical conditions

C. nerves

D. all of these

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The process of breathing-in of oxygen rich air from outside is called

A. expiration

B. inspiration

C. respiration

D. oxidation

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The "mountain sickness" in persons climbing to high attitudes without the aid of oxygen cylinders is due to

A. lack of sufficient amount of haemoglobin

B. lack of sufficient amount of erythrocytes

C. arterial hypoxia

D. anaemic hypoxia

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In rabbits, respiration takes place in

A. Cells lining the lung cavities

B. Cells found in blood

C. All living cells of the body

D. RBC only

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In response to high altitude hypoxia supply of oxygen to the tissue is maintained by

A. increased alveolar ventilation and increased cardiac output

B. shift in the haemoglobin dissociation curve to the right

C. increased erythrocytes and haemoglobin content of blood

D. all of these

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Tissue respiration is a process by which

A. carbohydrates are synthesised

B. proteins are broken down

C. fat molecules are metabolised

D. energy is liberated

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The carbon dioxide pressure in the lung capillaries is

A. less than that in alveolar air

B. more than that in alveolar air

C. equal to that in alveolar air

D. similar to oxygen pressure in the capillaries

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The respiratory portion of the respiratory tract consists of

A. Pharynx, larynx, trachea, bronchi and bronchioles

B. Trachea, bronchi, bronchioles, alveolar ducts and alveoli

C. Respiratory bronchioles, alveola ducts, alveolar sacs and alveoli

D. Bronchi, bronchioles, alveolar ducts, alveolar sacs and alveoli

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The oxygen content of expired air in man is

A. 3 per cent

B. 25 per cent

C. 16 per cent

D. 20 per cent

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Air directly enters the tracheae via the

A. external nares

B. pharynx

C. larynx

D. bronchi

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The respiratory disease immediately related to cigarette smoking is

A. hypercapnia

B. pulmonary edema

C. hypoxia

D. emphysema

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The maximum volume of inspirable air is called

A. vital capacity

B. residual volume

C. inspiratory capacity

D. any of these

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4

Emphysema is a respiratory disease in which

A. the larynx is closed

B. the trachea gets narrowed

C. the gas exchange area of lungs is increased

D. the gas exchange area of lungs is decreased

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4

The rate and depth of breathing is primarily controlled by medulla by

A. the oxygen content of the blood

B. the nitrogen content of the blood

C. receptors in the larynx

D. the carbon dioxide content of the bkxxl

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4

In frog, the alveoli are surrounded by

A. flattened and ciliated cells to increase the surface area of lungs

B. columnar and ciliated cells to increase the surface area of lungs

C. only ciliated cells to increase the surface area of lungs

D. only squamous cells to decrease the surface area of lungs

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Internal respiration refers to

A. exchange of gases between lungs and blood

B. cellular respiration

C. exchange of gases between lungs and atmosphere

D. respiration in open air

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The capacity of lungs for air in a healthy man is about

A. 500 ml

B. 1000 ml

C. 2000 ml

D. 3000 ml

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Ciliated epithelium in the trachea of mammals helps in

A. sucking-in air

B. pushing expired air out

C. pushing mucus out

D. keeping the alveolar air in circulation

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During inspiration in mammals, the diaphragm shall

A. Contract

B. relax

C. expand

D. shows no change

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The oxygen pressure in the alveolar air is

A. less than that is lung capillaries

B. equal to that in lung capillaries

C. double of that in lung capillaries

D. half of that in lung capillaries

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The metal associated with haemoglobin is

A. Copper

B. Magnesium

C. Iron

D. Manganese

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The term used to denote the difference in volume between the total lung capacity and the vital capacity is

A. tidal volume

B. ventilation rate

C. residual volume

D. all of these

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Anoxia means

A. absence of oxygen

B. diminished amount of oxygen delivered to the tissues

C. both (a) and (b)

D. none of these

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Pulmonary artery

A. returns highly oxygenated blood to the left heart for distribution throughout the body

B. returns highly oxygenated blood to right heart for distribution throughout the body.

C. delivers blood to lungs low in oxygen

D. delivers highly oxygenated blood in lungs

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The respiratory tubes devoid of car-tilagenous rings are

A. trachea

B. bronchi

C. bronchioles

D. none of these

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A normal man respires in a minute

A. 25-30 times

B. 10-15 times

C. 14-18 times

D. 20-25 times

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The regulatory centre for respiration is situated in the

A. cerebral cortex

B. hypothalamus

C. medulla oblongata

D. procencephalon

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In a man at rest the body's cells consume approximately

A. 5000 ml of oxygen per day

B. 5000 ml of oxygen per hour

C. 500 ml of oxygen per hour

D. 200 ml of oxygen per minute

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Which of the following can respire in total absence of air (anoxyliosis)?

A. Amoeba

B. Bed bug

C. Hydra

D. Tapeworm

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Among the following, the maximum amount of usable energy is released per-molecule of glucose by

A. yeast cell in fermentation

B. a liver cell in glycolysis

C. an Amoeba in aerobic respiration

D. a muscle cell in lactic acid formation