Concept explainers
Chest and shoulder muscles that move the arm at the shoulder joint have insertions on the
a. scapula.
b. clavicle and ribs.
c. humerus
d. radius or ulna.
Introduction:
A joint is a connection between the bones in the body. The function of the joints is to allow various degrees and types of movements in the body. There are certain frictionless joints, such as knee, elbow, and shoulder. These joints can withstand compression and heavy weights easily.
Answer to Problem 1PL
Correct answer:
Option (c), humerus.
Explanation of Solution
Explanation/justification for the correct answer:
Option (c) humerus. Chest and shoulder muscles make the arm movement at the shoulder joint. These two muscles have insertion at the humerus. Hence, this option is correct.
Explanation for incorrect answer:
Option (a) scapula. The scapula is the insertion for the levator scapulae muscle. The scapula is present on both the sides of the upper back and just behind the shoulders. Hence, this option is incorrect.
Option (b) clavicle and ribs. The subclavius muscle has insertion at the clavicle and the rib cage. Hence, this option is incorrect.
Option (d) radius or ulna. The biceps have an origin at the shoulder joint and insertion at the radius, near the elbow joint. Hence, this option is incorrect.
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Chapter 23 Solutions
Laboratory Manual For Human Anatomy & Physiology
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