Breathing and Exchange of Gases MCQs | Breathing and Exchange of Gases Short Questions and Answers

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Questions
1 ____________ ml of oxygen is transported per deciliter of blood.
A 20ml
B 40ml
C 10ml
D 50ml

Answer:20ml
2 Which of the following binds stronger to hemoglobin?
A Oxygen
B Carbon dioxide
C Carbon monoxide
D Carbon disulphide

Answer:Carbon monoxide
3 The factor which does not affect the rate of alveolar diffusion is __________
A Solubility of gas
B Reactivity of gas
C Thickness of membrane
D Concentration gradient

Answer: Reactivity of gas
4 A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This oxygen ___________
A helps in releasing more oxygen to tissues
B raises the pCO2 of blood to 75mm of Hg
C acts as a reserve during muscular exercise
D is enough to keep oxyhemoglobin saturation at 96%

Answer:acts as a reserve during muscular exercise
5 The urge to inhale in humans results from _________
A Rising Pco2
B Rising O2
C Falling PCO2
D Falling PO2

Answer: Rising Pco2
6 Blood analysis of a patient reveals an unusually high quantity of carboxyhemoglobin content. Which of the following conclusion is most likely to be correct? The patient has inhaled polluted air containing high amount of __________
A Carbon dioxide
B Chloroform
C Carbon monoxide
D Carbon disulphide

Answer: Carbon monoxide
7 Which of the following is true about hemoglobin?
A Present in dissolved state in blood plasma in scorpion
B Present in dissolved state in blood plasma in earthworm
C It is a dipeptide and present in RBCs in blood worm
D It is a dipeptide in mammals and present in RBCs

Answer: Present in dissolved state in blood plasma in earthworm
8 RBCs and adipose tissue cells respire anaerobically because they ________
A posses very few mitochondria
B posses carbonic anhydrase
C posses large amount of energy
D posses less energy

Answer:posses very few mitochondria
9 Lack of oxygen to the brain can make the person feel ___________
A hyperactive
B sleepy
C depressed
D gasping for air

Answer: sleepy
10 Oxygen diffuses out of blood into tissues because __________
A Oxygen concentration of tissue fluid is lower
B Oxygen concentration of blood is lower
C Carbon dioxide concentration of tissue fluid is lower
D Carbon dioxide concentration of tissue fluid is higher

Answer: Oxygen concentration of tissue fluid is lower
11 Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at ____________
A Pons
B Spinal cord
C Left hemisphere
D Thalamus

Answer: Pons
12 Which of the following is the cofactor of carbonic anhydrase?
A Zn
B Fe
C Mg
D Cu

Answer: Zn
13 Breathing rate in human is controlled by _____________
A Medulla oblongata
B Cerebellum
C Hypothalamus
D Thalamus

Answer: Medulla oblongata
14 Humans breathe by negative pressure.
A True
B False

Answer:True
15 The primary stimulus for respiratory centre is ___________
A Carbon dioxide and hydrogen ions
B Oxygen gas level in blood
C Oxygen gas level in hemoglobin
D Conscious feeling for need of oxygen

Answer: Carbon dioxide and hydrogen ions
16 The respiratory centre sends out nerve impulses to __________
A Control center in brain
B Diaphragm and rib cage
C Carotid and aortic bodies
D Muscles of the body that regulate the use of oxygen

Answer:Diaphragm and rib cage
17 Emphysema is a ______________
A Neural disease
B Digestive disorder
C Pulmonary disease
D Renal disease

Answer: Pulmonary disease
18 Congestion of lungs in one of the main symptoms in ________
A Heart failure
B Angina
C Hypotension
D Atherosclerosis

Answer:Atherosclerosis
19 SARS is ________
A An acute form of asthma
B Caused by variant of Corona virus
C Caused by a variant of Pneumococcus pneumoniae
D Affects non vegetarians faster

Answer: Caused by variant of Corona virus
20 Alveoli become enlarged and damaged with reduced surface area in heavy smokers. This condition is called ___________
A Emphysema
B Silicosis
C Asthma
D Bronchitis

Answer:Emphysema

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