Question:
Which of the following statements are correct?
(A) Intrathoracic pressure decreases during inspiration.
(B) Activation of pneumotaxic center stimulates inspiration.
(C) During expiration, pressure gradient operates from lungs to the atmosphere.
(D) Cavity of lungs decreases during expiration.
(E) Diaphragm contracts during expiration.
Select the correct option
Which of the following statements are correct?
(A) Intrathoracic pressure decreases during inspiration.
(B) Activation of pneumotaxic center stimulates inspiration.
(C) During expiration, pressure gradient operates from lungs to the atmosphere.
(D) Cavity of lungs decreases during expiration.
(E) Diaphragm contracts during expiration.
Select the correct option
(A) Intrathoracic pressure decreases during inspiration.
(B) Activation of pneumotaxic center stimulates inspiration.
(C) During expiration, pressure gradient operates from lungs to the atmosphere.
(D) Cavity of lungs decreases during expiration.
(E) Diaphragm contracts during expiration.
Select the correct option
Show Hint
Inspiration lowers intrathoracic pressure; pneumotaxic centre inhibits inspiration; the diaphragm relaxes in expiration.
Updated On: Nov 12, 2026
- C, D and E only
- A and B only
- A, C and D only
- D and E only
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Breathing depends on pressure differences created by changes in thoracic volume.
Step 2: Check A, B and C
(A) Correct: in inspiration the thoracic cavity enlarges so intrathoracic pressure falls.
(B) Incorrect: the pneumotaxic centre moderates the rate of breathing by inhibiting inspiration.
(C) Correct: in expiration lung pressure is above atmospheric pressure, so air flows out.
Step 3: Check D and E
(D) Correct: during expiration the lungs recoil and their cavity decreases.
(E) Incorrect: the diaphragm contracts during inspiration and relaxes during expiration.
Step 4: Select the option
The correct statements are A, C and D only.
Final Answer:
Statements A, C and D are correct. \[ \boxed{\text{(C) }\text{A, C and D only}} \]
Breathing depends on pressure differences created by changes in thoracic volume.
Step 2: Check A, B and C
(A) Correct: in inspiration the thoracic cavity enlarges so intrathoracic pressure falls.
(B) Incorrect: the pneumotaxic centre moderates the rate of breathing by inhibiting inspiration.
(C) Correct: in expiration lung pressure is above atmospheric pressure, so air flows out.
Step 3: Check D and E
(D) Correct: during expiration the lungs recoil and their cavity decreases.
(E) Incorrect: the diaphragm contracts during inspiration and relaxes during expiration.
Step 4: Select the option
The correct statements are A, C and D only.
Final Answer:
Statements A, C and D are correct. \[ \boxed{\text{(C) }\text{A, C and D only}} \]
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