Biology Chapter 9 Entry test MCQs
101. Surfactant is present in:
a. Bronchioles
b. Bronchi
c. Trachea
d. Alveoli
102. Which of the following is not a function of surfactants?
a. Reduce surface tension
b. Filtration of blood
c. Act as antiseptic
d. Increase gases exchange
103. During exercise, the breathing rate may rise to:
a. 30 times per minute
b. 15 times per minute
c. 25 times per minute
d. 20 times per minute
104. Which energy is consumed in breathing?
a. Potential
b. Chemical
c. Mechanical
d. Physical
105. Find out the incorrect statement:
a. Amount of N2 is equal in both inhaled and exhaled air
b. Inspired air contains more O2 than exhaled air
c. Exhaled air is comparatively drier than inhaled air
d. Expired air 100 times greater CO2 as inspired air
106. During inspiration fresh air moves in, which has high percentage of:
a. N2
b. CO
c. CO2
d. O2
107. pressure of oxygen is maximum in:
a. Expired air
b. Inspired air
c. Oxygenated blood
d. Alveolar air
108. Which of the following play passive role during breathing?
a. Diaphragm
b. Lungs
c. Pleura
d. Intercostal muscles
109. Which of the following factors does not alter the rate of breathing by influencing the chemoreceptors in medulla oblongata, in the blood aorta and carotid artery?
a. O2 partial pressures in the blood
b. CO2 partial pressures in the blood
c. Blood glucose level
d. H+ concentration in the blood
110. If you hold your breath for a long time, CO2 levels are likely to————and the PH of body fluid is likely to————.
a. Decrease, Increase
b. Increase, decrease
c. Decrease, decrease
d. Increase, increase
111. During expiration, the diaphragm becomes:
a. Flattened
b. Less dome-shaped
c. More dome-shaped
d. Oblique
112. During inspiration, the diaphragm:
a. Relax and rises
b. Contructs and relax
c. Relax and goes downward
d. Contracts and goes downward
113. Breathing consists of:
a. Three phases
b. Four phases
c. Two phases
d. One phase
114. The low levels of surfactant produced by alveolar epithelium causes:
a. Bronchitis
b. Emphysema
c. Asthma
d. Respiratory distress syndrome
115. During inspiration the space inside the chest cavity is increased due to:
a. The relaxation of the muscle of the diaphragm
b. Increased pressure
c. The contraction of the muscles of the diaphragm
d. Relaxation of the external intercostal muscle
Transport of Respiratory Gases
116. Diffusion of respiratory gases is inversely proportional to:
a. Difference in concentration
b. Surface area
c. Presence of moisture
d. Thickness of the membrane
117. At normal alveolar ventilation, the respiratory center is stimulated by:
a. CO2 concentration in arterial blood
b. O2 concentration in venous blood
c. O2 concentration in arterial blood
d. CO2 concentration in venous blood
118. Which one of these shows the path of blood after it leaves the lungs?
a. Pulmonary Artery-Left Atrium-Left Ventricle – Aorta
b. Pulmonary Vein-Left Atrium-Left Ventricle – Aorta
c. Pulmonary Artery-Right Atrium-Right Ventricle – Aorta
d. Pulmonary Vein-Right Atrium-Right Ventricle-Aorta
119. Which of the following correctly describes the binding affinities of gases with haemoglobin
a. O2>CO2>CO >
b. CO > CO2>O2
c. O2>CO2>CO
d. CO2>O2 >CO
120. Just after inhalation, the highest partial pressure of oxygen will be in:
a. B and C
b. Only A
c. D and E
d. Only E
121. All of the following occur due to presence of carbon dioxide in blood except:
a. Makes blood more acidic
b. Increases rate of breathing
c. Oxygen carrying capacity of Hb decreases
d. Increases respiratory volume
122. The amount of CO2 in pulmonary artery is:
a. 60ml/100ml of blood
b. 54ml/100ml of blood
c. 4ml/100ml blood
d. 50ml/100ml of blood
123. Which of the following incorrectly explains the binding of inorganic component in structures found in erythrocytes?
a. O2 with F++ of haem
b. CO with organic portion of haem
c. H+ with COOH group of haemoglobin
d. CO2 with NH2 group of haemoglobin
124. Which of the following shows maximum solubility in blood plasma?
a. Nitrogen
b. Oxygen
c. Carbon monoxide
d. Carbon dioxide
125. Amount of oxygen absorbed by haemoglobin at 115 mmHg per 100 ml of blood is:
a. 13.4 ml
b. 20 ml
c. 19.6 ml
d. 16 ml