Breathing and Respiration, Exchange of Gases - Short answer Biology objective questions for NEET-UG, AIPMT, MBBS admission tests and similar exams


Breathing and Respiration, Exchange of Gases

(NEET-UG, NEST, MBBS, Dental admission Tests - Syllabus): Respiratory organs in animals (recall only); Respiratory system in humans; Mechanism of breathing and its regulation in humans-Exchange of gases, transport of gases and regulation of respiration Respiratory volumes; Disorders related to respiration-Asthma, Emphysema, Occupational respiratory disorders.

HUMAN PHYSIOLOGY (Breathing and Respiration, Exchange of Gases)
Biology Objective Type Theoretical Questions - TQ 3 (Q. No.61-67)
Short Answer Type Questions (Answers & Solutions given below)
Question: 61: How does haemoglobin help in the transport of oxygen from to tissues?
Question: 62: What is the vital capacity of lungs?
Question: 63: What is the role of carbonic anhydrase in humans? Where is it present?
Question: 64: Write down the reaction facilitated by an enzyme carbonic anhydrase present in RBCs.
Question: 65: In which form, CO2 is trapped at the tissue level?
Question: 66: How pneumotaxic centre regulates the respiratory rate?
Question: 67: How can a person prevent himself from occupational respiratory diseases?
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India Study Solution
Biology Guide: Breathing and Respiration, Exchange of Gases
Solutions of Biology Objective Short Answer Type Theoretical Questions - TQ 3 (Q. No. 61-67)
Solution-61: Transport of oxygen: Haemoglobin is a red coloured pigment present in RBC. O2 can bind with Hb in a reversible manner to form oxyhaemoglobin. This transport 97% to 99% oxygen as oxyhaemoglobin.
Solution-62: Volume of air, which expired forcefully after forceful inspiration.
Vital capacity = IRV+ERV+TV
                         = 3000+1100+500
= 4600 ml.
Solution-63: This percentage of CO2 diffuse in RBC and dissolve in water of cytoplasm to form carbonic acid. Formation of carbonic acid is occurring in presence of carbonic anhydrase enzyme, which increase rate of formation of carbonic acid 5000 times. It is present in RBC.
Solution-64: image

Solution-65: Nearly 20-25% of CO2 is transported by RBCs whereas 70% of it is carried as bicarbonate. About 7% of CO2 is carried in a dissolved state through plasma. HCO3- ions (bicarbonate ions).
Solution-66: Strong neural signal from this center to inspiratory area increased the rate of breathing because inspiration and expiration is shortened.
Solution-67: (i) By wearing protective masks. (ii) By avoiding prolonged exposure to harmful substances.
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