Answer :
Final answer:
The muscle that inserts onto the coronoid process and tuberosity of the ulna and acts only across the elbow joint is the brachialis muscle.
Explanation:
The muscle that inserts onto the coronoid process and tuberosity of the ulna and acts only across the elbow joint is the brachialis muscle.
The brachialis muscle is a key muscle in the upper arm that lies underneath the biceps brachii. It originates from the lower half of the front of the humerus and inserts onto the coronoid process and tuberosity of the ulna. The brachialis muscle is responsible for flexing the forearm at the elbow joint. It acts as a powerful flexor and is involved in various activities such as lifting weights, throwing, and performing push-ups.
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