The muscles involved in forced expiration are primarily the abdominal muscles, including the rectus abdominis and the external oblique. So, the correct options are B. Rectus abdominis and C. External oblique.

Here's a step-by-step explanation:

1. During normal breathing, expiration is a passive process that does not require muscles to work. This is because the lungs are elastic and naturally recoil to expel air.

2. However, during forced expiration, such as when you blow out a candle or cough, additional muscles are needed.

3. The abdominal muscles, including the rectus abdominis and external oblique, contract.

4. This increases the pressure inside the abdomen and pushes up the diaphragm.

5. The increased pressure in the chest cavity helps to force more air out of the lungs than during a normal exhalation.

6. Therefore, the rectus abdominis and external oblique are considered forced expiration muscles.

The

Question

The muscles involved in forced expiration are primarily the abdominal muscles, including the rectus abdominis and the external oblique. So, the correct options are B. Rectus abdominis and C. External oblique.

Here's a step-by-step explanation:

1. During normal breathing, expiration is a passive process that does not require muscles to work. This is because the lungs are elastic and naturally recoil to expel air.

2. However, during forced expiration, such as when you blow out a candle or cough, additional muscles are needed.

3. The abdominal muscles, including the rectus abdominis and external oblique, contract.

4. This increases the pressure inside the abdomen and pushes up the diaphragm.

5. The increased pressure in the chest cavity helps to force more air out of the lungs than during a normal exhalation.

6. Therefore, the rectus abdominis and external oblique are considered forced expiration muscles.

The

Knowee AI · Accepted Answer

The muscles involved in forced expiration are primarily the abdominal muscles, including the rectus abdominis and the external oblique. So, the correct options are B. Rectus abdominis and C. External oblique.

Here's a step-by-step explanation:

1. During normal breathing, expiration is a passive process that does not require muscles to work. This is because the lungs are elastic and naturally recoil to expel air.

2. However, during forced expiration, such as when you blow out a candle or cough, additional muscles are needed.

3. The abdominal muscles, including the rectus abdominis and external oblique, contract.

4. This increases the pressure inside the abdomen and pushes up the diaphragm.

5. The increased pressure in the chest cavity helps to force more air out of the lungs than during a normal exhalation.

6. Therefore, the rectus abdominis and external oblique are considered forced expiration muscles.

The

Which of the following are forced expiration muscles? A. Diaphragm B. Rectus abdominis C. External oblique

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