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Breathing and Respiration, Exchange of Gases - Biology Objective Questions for NEET-UG, AIPMT, MBBS and Dental admission tests


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 2 (Q. No. 31-60)

Very Short Answer Type Questions (Answers / Solutions given below)
Question: 31: Among all the respiratory volumes, which has lowest value?
Question: 32: Which is the primary site for exchange of gases?
Question: 33: How are gases like O2 and CO2 exchanged in our body?
Question: 34: Why is O2 gas passed from atmospheric air to alveoli?
Question: 35: Which epithelium lines the alveoli?
Question: 36: Which gas, out of O2 and CO2 is more soluble?

Question: 37: What is the thickness of diffusion membrane?
Question: 38: How many layers form the diffusion membrane?
Question: 39: Why is CO2 gas transferred from alveoli to atmospheric air?
Question: 40: Which gas has higher partial pressure in tissues?
Question: 41: What is the medium of transport for O2 and CO2?
Question: 42: What is the percentage of O2 transported in bound form?
Question: 43: What is oxygen-dissociation curve?
Question: 44: Which compound is formed when O2 binds with Hb?
Question: 45: What is the shape of O2-dissociation curve for haemoglobin?
Question: 46: Write any two factors that are favourable for the formation of oxyhaemogloin.
Question: 47: Which compound is formed when CO2 binds with Hb?
Question: 48: What are the conditions responsible for more binding of CO2 with Hb in tissues?
Question: 49: What is the percentage of CO2 transported as bicarbonate ions?
Question: 50: How much CO2 is delivered to the alveoli by every 100 ml of deoxygenated blood?
Question: 51: Which is the main centre of brain that regulates the respiration rate?
Question: 52: Where is respiratory rhythm centre located in brain?
Question: 53: What is the location of pneumotaxic centre in brain?
Question: 54: Where is the chemosensitive area located in the brain, which regulates the respiration?
Question: 55: To which substances, chemosensitive area is highly sensitive?
Question: 56: A person faces difficulty in breathing, produces sound during breathing. Name the disease from which he suffers.
Question: 57: What is the main cause of Emphysema?
Question: 58: What happens to bronchi and bronchioles during asthma?
Question: 59: Why is surface area for exchange of gases deceased during Emphysema?
Question: 60: Give two examples of occupational respiratory disorders.

India Study Solution
Biology Solutions: Breathing and Respiration, Exchange of Gases
Solutions of Biology Objective Very Short Answer Type Questions - TQ 2 (Q. No. 31-60)

Solution-31: Tidal volume (TV). Solution-32: Alveoli. Solution-33: By simple diffusion based on pressure gradient.Solution-34: It is because the pO2 in atmospheric air is higher, i.e., 159 mm Hg than in alveoli, i.e., 104 mm Hg. Solution-35: Squamous epithelium. Solution-36: CO2 is more soluble, 20-25timeshigher than that of O2. Solution-37: 0.2mm. Solution-38 : 3. Solution-39: It is because the pCO2 in alveoli is higher, i.e., 40 mm Hg than in atmospheric air, i.e., 0.3 mm Hg. Solution-40: CO2. pCO2is higher than pO2 in tissues. Solution-41: Blood. Solution-42: About 97%. Solution-43: A graphic representation between the relationship between pO2 and percentage saturation of Hb with O2. Solution-44:  Oxyhaemoglobin. Solution-45:  It is sigmoid or ‘S’ shaped. Solution-46: High pO2 and low pCO2. Solution-47: Carbaminohaemoglobin. Solution-48: High pCO2 and low pO2. Solution-49: About 70%. Solution-50: 4 ml. Solution-51:  Respiratory rhythm centre. Solution-52: Medulla oblongata of hindbrain. Solution-53: Pons region of hindbrain. Solution-54:  It is located adjacent to the respiratory rhythm centre in the medulla region. Solution-55: CO2 and H+ ions. Solution-56: Asthma. Solution-57: Excessive cigarette smoking. Solution-58: Inflammation occurs in bronchi and bronchioles. Solution-59: It is decreased due to breakdown of alveolar walls. Solution-60: Silicosis and asbestosis.

BREATHING and RESPIRATION - More Objective Questions with Answers
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