52.4k views
5 votes
Consists of multipennate fascicle arrangement.

A) pectoralis major
B) semitendinosus
C) no choices are correct
D) biceps brachii

User Kerwin
by
7.4k points

1 Answer

3 votes

Final answer:

The deltoid muscle has a multipennate fascicle arrangement and is not listed among the choices given, making 'C) no choices are correct' the accurate answer. Also, the triceps brachii is responsible for extending the forearm.

Step-by-step explanation:

The muscle with a multipennate fascicle arrangement is the deltoid muscle. This type of muscle structure allows the deltoid to contract and cause the arm to abduct, or move away from the midline of the body. Therefore, the correct choice is 'C) no choices are correct,' since none of the options provided (pectoralis major, semitendinosus, biceps brachii) have a multipennate arrangement. The deltoid muscle is known for its multipennate structure which also enables it to perform more complex movements when specific fascicles are stimulated, such as abduction combined with flexion when only the anterior fascicle is stimulated.

Additionally, the triceps brachii is the muscle that extends the forearm. This three-headed muscle is responsible for extending the forearm at the elbow joint, which is important for movements like pushing or throwing.

User Andrew Seguin
by
7.5k points