6 How do a muscle\'s origin and insertion differ? Which of the following muscles

Question

6 How do a muscle's origin and insertion differ? Which of the following muscles extends the forearm at the elbow joint? a. Brachioradialis m. b. Triceps brachii m. c. Biceps brachii m. d. Brachialis m. 7 8 Which of the following muscles flexes the thigh at the hip? a. lliopsoas m. b. Biceps femoris m. C. Vastus intermedius m. d. Gluteus medius m. 10 9 What is the main action of the deltoid muscle? a. Adduction of the arm at the shoulder joint. b. Retraction of the scapula. c. Depression of the scapula. d. Abduction of the arm at the shoulder joint 10 What is the main action of the rectus abdominis muscle? a. Rotation of the trunk. b. Flexion of the trunk. c. Extension of the trunk. d. Lateral flexion of the trunk.

Explanation / Answer

6. origin of a muscle is nothing but a fixed attachemnt of a musclle at the bones of each tendons. where as the insertion of a muscle can moves with the contraction.

7.a. if we take the branchioradialis, it is the muscle of the forearm which flexes the muscle at the elbow joint. so option a is incorrect.

c. biceps branchii is a have 2 heads and it is occur in between the shoulder and elbow. so option b is also incorrect.

d. branchialis is also a muscle of a upper arm, and it involves in the flex of the elbow joint. so option d is also incorrect.

b. tricep branchii is a extendes the forearm. it originates on the scapula. so option b is correct.

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