\begin{tabular}{|l}\hline Question 7 \ Which of the following muscles is a synergist to flexion in the upper arm? \ Coracobrachialis \ Triceps \ Brachialis \ Biceps femoris \ \hline\end{tabular}

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To determine which muscle is a synergist to flexion in the upper arm, we need to understand the concept of synergists in muscle physiology.

Synergists are muscles that work together to produce a specific movement or action. In the case of flexion in the upper arm, the primary flexor muscle is the biceps brachii. However, the biceps brachii cannot perform flexion alone, and it needs the assistance of other muscles to achieve this movement.

Let's analyze the options provided:

1. Coracobrachialis: This muscle assists in flexion of the shoulder joint and is not directly involved in flexion of the upper arm.
2. Triceps: The triceps brachii is an extensor muscle of the elbow joint, not a flexor. It is not a synergist to flexion in the upper arm.
3. Brachialis: The brachialis muscle is a flexor of the elbow joint and works synergistically with the biceps brachii to produce flexion in the upper arm.
4. Biceps femoris: This muscle is located in the thigh and is involved in knee flexion, not upper arm flexion.

Therefore, the correct answer is the Brachialis muscle, as it is a synergist to flexion in the upper arm.
The Brachialis muscle is a synergist to flexion in the upper arm.

\begin{tabular}{|l}\hline Question 7 \\ Which of the following muscles is a synergist to flexion in the upper arm? \\ Coracobrachialis \\ Triceps \\ Brachialis \\ Biceps femoris \\ \hline\end{tabular}

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