What physical changes affect the volume of the lungs?
A)The contraction of the abdominal muscles affect the volume of the lungs.
B)The degree of flexion and extension of the trunk affect the volume of the lungs.
C)The movements of the upper limbs affect the volume of the lungs.
D)The movements of the diaphragm and rib cage affect the volume of the lungs.
E)The contraction of tracheal smooth muscle affect the volume of the lungs.

Question

Quizplus · Accepted Answer

The movements of the diaphragm and rib cage are the primary factors that affect the volume of the lungs during breathing. When the diaphragm contracts and moves downwards, it creates more space in the chest cavity, causing the lungs to expand and take in air. When the rib cage expands and moves outwards, it also increases the space in the chest cavity, allowing the lungs to expand further. Conversely, when the diaphragm and rib cage relax and move upwards, the volume of the lungs decreases, forcing air out. The other choices do not directly affect lung volume.

What Physical Changes Affect the Volume of the Lungs