Which of the following statement is correct?

Options

A. The contraction of internal intercostal muscles lifts up the ribs and sternum.
B. The RBCs transport oxygen only.
C. The thoracic cavity is anatomically an air tight chamber.
D. Healthy men cap inspire appromixmately `500` mL of air per minute.

Answer

C

Explanation

The thoracic cavity is anatomically an air tight chamber as it consists of lungs that further consists of air sacs in which the air remains trapped. The contraction of the external intercostal muscles lifts up the ribs the sternum. RBCs transport both `O_(2)` and `CO_(2)`. Healthy man can inspire or expire `6000` to `8000` mL of air pre minute.