FIGURE 7.20 Facial muscu Which of the following muscles is not a forearm flexor
ID: 3475592 • Letter: F
Question
FIGURE 7.20 Facial muscu Which of the following muscles is not a forearm flexor at the elbow? a. Brachioradialis b. Triceps brachii Biceps brachii d. Brachialis Which of the following muscles does not extend the hip and flex the knee a. Sartorius b. Biceps femoris c. Semimembranosus d. Semitendinosus 7Which of the following muscles is the prime abductor of the arm at the a. Pectoralis major b. Latissimus dorsi c. Pectoralis minor d. Deltoid 78 I Exploring Anatomy& Physiology in the Laboratory: Core ConceExplanation / Answer
5. The triceps brachii muscle, a large muscle on the back of the upper limb, controls the extension of the elbow joint. It is the extensor of the arm and is involved in activities of pushing, throwing, hammering, or shoveling. Flexor muscles are anti-gravity muscles, working against gravity. Since the triceps brachii is not involved in anti- gravity activities, it is not a flexor muscle. The flexor muscle is the Brachialis that is assisted by the Biceps brachii. Brachioradalis flexes the forearm at the elbow. Right option is ‘b’
6. The sartorius muscle is biarticulate. It crosses two joints especially the hip and knee joints. It helps to sit cross-legged on the floor. It can only externally rotate and abduct the hip. Its ability to flex the knee is very weak. Right option is ‘a’
7. The deltoid muscle forms the rounded contour of the shoulder. Abduction function in a muscle is required to pull a body part away from the midline. The deltoid muscle prevents shoulder dislocation. It abducts the arm up to 90 degrees away from the midline. Right option is ‘d’.
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