Ventilation perfusion ratio is maximum in_______________?
(A) Base of lung
(B) Apex of lung
(C) Posterior lobe of lung
(D) Middle lobe of lung
Increase in partial pressure of CO2 leading to release of oxygen to the tissues is________________?
(A) Haldane effect
(B) Bohr effect
(C) Breur effect
(D) Hamburger effect
Which of the following statements about pulmonary surfactant is false ?
(A) It is secreted by Type II pneumocytes
(B) It contains lecithin and sphingomyelin
(C) It increases surface tension
(D) It prevents collapse of smaller alveoli
At high altitudes the following changes takes place except_______________?
(A) Increase in respiratory rate
(B) Increases in depth of respiration
(C) Increase in oxygen carrying capacity of blood
(D) Increase in partial pressure of CO2
Tubuloglomerular feedback occurs in______________?
(A) ADH secretion in collecting duct
(B) Constant solute load on distal tubule
(C) Macula densa
(D) Balance between ascending and descending loop of henle
During inspiration when the diaphragm contracts, the intrapleural pressure becomes_____________?
(A) More negative
(B) Less negative
(C) Positive
(D) Equal to the intra alveolar pressure
The major sign of hypoventilations_____________?
(A) Cyanosis
(B) Dyspnea
(C) Hypercapnia
(D) Hypoxia
Most effective method of assessing breathing is by measuring____________?
(A) Tidal volume
(B) Respiratory rate
(C) Alveolar ventilation
(D) FEV 1
Oxygen dissociation curve shifts to the right by all of the following except_____________?
(A) Rise in temperature
(B) Rise in carbon dioxide tension
(C) Rise in pH
(D) Rise in H+ ion
The best stimulator of respiratory center is____________?
(A) Decrease in arterial carbon dioxide level
(B) Increase in arterial carbon dioxide level
(C) Increase in arterial oxygen level
(D) None of the above