The muscles that contract during inhalation are both the External intercostal muscles and the Radial muscle of the diaphragm. So, the correct answer is "Both 1 and 2".

Here's a step-by-step explanation:

1. During inhalation, the diaphragm contracts and moves downward. This increases the space in the chest cavity, into which the lungs expand.

2. The intercostal muscles between the ribs also help enlarge the chest cavity. They contract to pull the rib cage both upward and outward when we inhale.

3. The external intercostal muscles are responsible for the elevation of the ribs and the expansion of the thoracic cavity, contributing to the inhalation process.

4. The radial muscle of the diaphragm also contracts during inhalation, allowing the diaphragm to flatten and increase the volume of the thoracic cavity for lung expansion.

5. The internal intercostal muscles are not involved in the inhalation process; they are primarily involved in forced or active exhalation. They depress the ribs and decrease space in the chest cavity.

Question

The muscles that contract during inhalation are both the External intercostal muscles and the Radial muscle of the diaphragm. So, the correct answer is "Both 1 and 2".

Here's a step-by-step explanation:

1. During inhalation, the diaphragm contracts and moves downward. This increases the space in the chest cavity, into which the lungs expand.

2. The intercostal muscles between the ribs also help enlarge the chest cavity. They contract to pull the rib cage both upward and outward when we inhale.

3. The external intercostal muscles are responsible for the elevation of the ribs and the expansion of the thoracic cavity, contributing to the inhalation process.

4. The radial muscle of the diaphragm also contracts during inhalation, allowing the diaphragm to flatten and increase the volume of the thoracic cavity for lung expansion.

5. The internal intercostal muscles are not involved in the inhalation process; they are primarily involved in forced or active exhalation. They depress the ribs and decrease space in the chest cavity.

Knowee AI · Accepted Answer

The muscles that contract during inhalation are both the External intercostal muscles and the Radial muscle of the diaphragm. So, the correct answer is "Both 1 and 2".

Here's a step-by-step explanation:

1. During inhalation, the diaphragm contracts and moves downward. This increases the space in the chest cavity, into which the lungs expand.

2. The intercostal muscles between the ribs also help enlarge the chest cavity. They contract to pull the rib cage both upward and outward when we inhale.

3. The external intercostal muscles are responsible for the elevation of the ribs and the expansion of the thoracic cavity, contributing to the inhalation process.

4. The radial muscle of the diaphragm also contracts during inhalation, allowing the diaphragm to flatten and increase the volume of the thoracic cavity for lung expansion.

5. The internal intercostal muscles are not involved in the inhalation process; they are primarily involved in forced or active exhalation. They depress the ribs and decrease space in the chest cavity.

Which muscle contracts during inhalation?External inter costal muscleRadial muscle of diaphragmBoth 1 and 2Internal inter costal muscle

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