MCQs of Physiology – Respiratory System

During inspiration when the diaphragm contracts, the intrapleural pressure becomes:

A decrease in the arterial PO₂ is seen in:

The major sign of hypoventilationis:

tidal volume in adult is:

Most effective method of assessing breathing is by measuring :

The volume of gas in the lungs at the end of normal expiration is

Oxygen dissociation curve shifts to the right by all of the following except:

The type of hypoxia present in high attitude is:

The best stimulator of respiratory centre is:

Vital capacity is decreased, timed vital capacity (FEV 1.0 %) is normal in:

What effect does hyperventilation have on the oxygen binding affinity of hemoglobin?

Surfactant is secreted by :

During the initial part of inspiration , which of the following does not occur?

Alveolar O₂ tension is:

Cyanosis or bluish coloration of skin and mucus membrane depends upon:

Hypoxia is characterized by :

Limitation of inspiration by vagal lung inflation signals is called the:

The intrapleural pressure at the end of deep inspiration is :

Smoking causes:

The alveolar ventilation in an individual with tidal volume: 600 ml, dead space 150 ml and respiratory rate of 15/ minute is :

Non- respiratory function of the lung is:

Oxygen dissociation cure is shifted to the right in all except:

Oxygen affinity is increased by all except

Muscle of expiration:

Arterial O₂ content is reduced in one of following :

In which of the following diseases would you expect to find an increase in thickness of the respiratory membrane?

Oxygen affinity decreases in:

Arterial PO₂ is reduced in:

Vital capacity is a measure of:

Which of the following does not stimulate alveolar hyperventilation ?

Ventilation perfusion ratio is maximum in:

The most common form of hypoxia is:

Increase in partial pressure of CO₂ leading to release of oxygen to the tissues is:

In haldane effect CO₂ dissociation curve is shifted to:

Which of the following statements about pulmonary surfactant is false?

The oxygen tension of the mixed venous blood is:

At high altitudes the following changes takes place except:

Kussmamul’s respiration occurs in response to

Shift of the oxygen dissociation curve to right is caused by the following factors EXCEPT:

Energy expenditure during normal breathing

The work of breathing

Normal intrapleural pressure during the start of inspiration is _________ mm of Hg.

In cases of hypercapnia there is

Bronchial circulation is associated with

Carbon monoxide poisoning causes

Which of the following adaptations will be apt to increase the work capacity at high altitude

An important non- respiratory function of lungs is:

The quantity of water lost in expired air each 24 hrs is about

What is true about pneumothorax?

Oxygen as an emergency drug is contraindicated in

The approximate amount of air left in the lungs after maximal forced expiration in a normal woman

The transport of CO is diffusion limited because

Inability of exchange of oxygen through lung tissue if known as:

Carotid body function in an organ work as: