Question

choose the correct answer. what muscle is m? pectoralis major deltoid rectus abdominus external oblique

Explanation:

To determine the muscle labeled M, we analyze the anatomical positions:

• The pectoralis major is a large chest muscle, which matches the position of M (over the chest area).
• The deltoid is a shoulder muscle (not matching M's position).
• The rectus abdominis is an abdominal muscle (lower, not chest).
• The external oblique is also an abdominal muscle (lateral, not chest).

Thus, M corresponds to the pectoralis major.

Answer:

A. pectoralis major (assuming the first option is A, as per typical multiple - choice labeling; if the original options had different labels, adjust accordingly, but based on the options given, the correct one is "pectoralis major")