Which of the following situations would result in the greatest degree of O 2 saturation for haemoglobin, assuming PO 2 remains constant-

Decreased CO 2 levels, decreased acidity.

Increased H + levels, decreased temperature.

Increased CO 2 levels, increased acidity.

Increased CO 2 levels, increased temperature.

Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?

Inflammation of bronchioles; decreased respiratory surface

Increased number of bronchioles; increased respiratory surface

Increased respiratory surface; inflammation of bronchioles

Decreased respiratory surface; inflammation of bronchioles

Asthma may be attributed to

allergic reaction of the mast cells in the lungs

accumulation of fluid in the lungs

bacterial infection of the lungs

Zoology - Breathing Exchange Gases - Quiz-6

Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of

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diaphragm
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neck
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tongue
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epiglottis

The figure given below shows a small part of the human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?

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A – Alveolar cavity – main site of exchange of respiratory gases
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D – Capillary wall – exchange of O₂and CO₂ takes place here
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B – Red blood cell – transport of CO₂ mainly.
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C – Arterial capillary – passes oxygen to tissues

Listed below are four respiratory capacities (1-4) and four jumbled respiratory volumes of a normal human adult
Respiratory capacities Respiratory volume

(a) Residual volume 2500 mL

(b) Vital capacity 3500 mL

(d) Inspiratory capacity 4500 mL

Which one of the following is the correct matching of two capacities and volumes?

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(c) 1200 mL, (a) 2500 mL
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(a) 2500 mL, (d) 4500 mL
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(b) 4500 mL, (c) 2500 mL
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(d) 4500 mL, (b) 3500 mL

What is true about RBCs in humans?

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they carry about 20-25 per cent of $C O_{2}$
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They transport 99.5 per cent of $O_{2}$
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They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma
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They do not carry $C O_{2}$ at all

An increase from pH 7.2 to pH 7.4 around hemoglobin causes

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hemoglobin to release all bound oxygen molecules.
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an increase in the affinity of hemoglobin to bind oxygen molecules.
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hemoglobin to denature.
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an increase in the binding of H⁺ by hemoglobin.

Increased asthmatic attacks in certain seasons are related to:

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hot and humid environment
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eating fruits preserved in tin containers
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inhalation of seasonal pollen
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low temperature

The 'blue baby' syndrome results from:

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excess of chloride
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methaemoglobin
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excess of dissolved oxygen
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excess of TDS (Total Dissolved Solids)

The majority of carbon dioxide produced by our body cells is transported to the lungs :

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dissolved in the blood
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as bicarbonates
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as carbonates
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attached to haemoglobin

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

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2700 mL
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1500 mL
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1700 mL
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2200 mL

Due to increasingg air-borne allergens and pollutants, many people in urban areas are suffering from resipratory disorder causing wheezing due to:

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reduction in the secretion of surfactants by pneumocytes
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benign growth on mucous lining of nasal cavity
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inflammation of bronchi and bronchioles
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profileration of fibrous tissues and damage of the alveolar walls

The efficiency of a respiratory system would be increased by all the following except:

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increase the surface area available for diffusion of gases
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decrease the distance over which the gases must diffuse
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increase the concentration differences of gases inside and outside the system
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dry the system out so the gases do not have to diffuse through water

How many of the statements given below are correct?
I. During inspiration the diaphragm moves upward while the thorax expands and moves outward.
II. The anatomical dead space represents the air that is trapped in the alveoli and is around 150mL.
III. Decreasing blood oxygen and increasing carbon dioxide cause the major increases seen in breathing rate during strenuous exercise.
IV. Oxygen dissociates faster from hemoglobin during exercise.
V. Increased pH shifts oxyHb-dissociation curve to the right.

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2
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3
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4
0%

5

“Binding of oxygen to hemoglobin makes hemoglobin a stronger acid” forms the physiological basis of:

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Herring-Breur Reflex
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Bohr effect
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Haldane effect
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Singultus

The maximum volume of air a person can breathe in after a forced expiration is known as :

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Expiratory Capacity
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Vital Capacity
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Inspiratory Capacity
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Total Lung Capacity

Select the correct events that occur during inspiration.

a. Contraction of diaphragm

b Contraction of external inter-costal muscles

c. Pulmonary volume decreases

d. Intra pulmonary pressure increases

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(c) and (d)
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(a), (b) and (d)
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only (d)
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(a) and (b)

Identify the wrong statement with reference to transport of oxygen :

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Partial pressure of CO₂ can interfere with O₂ binding with haemoglobin.
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Higher H⁺ concentration in alveoli favours the formation of oxyhaemoglobin.
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Low pCO₂ in alveoli favours the formation of oxyhaemoglobin.
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Binding of oxygen with haemoglobin is mainly related to partial pressure of O₂.

Which of the following is not a symptom of asthma?

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Difficulty in breathing
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Breathing noisily/wheezing
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Alveolar walls are damaged
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Inflammation of bronchi and bronchioles

Carbonic anhydrase plays an important role in the transport of carbon dioxide in

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Leucocytes
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Thrombocytes
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Erythrocytes
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Platelets

In which of the following disorders there is difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles?

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Emphysema
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Asthma
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Pleurisy
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Tuberculosis

Which of the following is a chronic respiratory disorder in which alveolar walls are damaged due to which respiratory surface is decreased? One of the major causes of this disease is cigarette smoking

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Asthma
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Emphysema
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Silicosis
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Pneumonia

The Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of forced inspiration. This includes :

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RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV
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RV; ERV; IC and EC
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RV; ERV; VC (Vital Capacity) and FRC (Functional Residual Capacity)
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RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume

Match the following columns and select the correct option :

Column - I Column - II

(a) Pneumotaxic Centre (i) Alveoli

(b) $O_{2}$ Dissociation curve (ii) Pons region of the brain

(d) Primary site of exchange (iv) R.B.C.
of gases

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(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
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(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
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(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
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(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :

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pO₂=95 and pCO₂ = 40
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pO₂ = 159 and pCO₂ =0.3
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pO₂ = 104 and pCO₂=40
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pO₂ = 40 and pCO₂=45

Select the favorable conditions required for the formation of oxyhemoglobin at the alveoli.

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High pO₂, high pCO₂, less H⁺, higher temperature
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Low pO₂, low pCO₂, more H⁺, higher temperature
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High pO₂, low pCO₂, less H⁺, lower temperature
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Low pO₂ high pCO₂ more H⁺, higher temperature

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Practice Zoology Quiz Questions and Answers

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Practice Zoology Quiz Questions and Answers

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