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Free download in PDF Breathing and Exchange of Gases Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
____________ ml of oxygen is transported per deciliter of blood.
[A]
20ml
[B]
40ml
[C]
10ml
[D]
50ml
(2)
Which of the following binds stronger to hemoglobin?
[A]
Oxygen
[B]
Carbon dioxide
[C]
Carbon monoxide
[D]
Carbon disulphide
(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
(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
(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
(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
(12)
Which of the following is the cofactor of carbonic anhydrase?
[A]
Zn
[B]
Fe
[C]
Mg
[D]
Cu
(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.
(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
(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
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