Skeletal Muscles Are Arranged in Antagonistic Pairs

question 7

Multiple Choice

Skeletal muscles are arranged in antagonistic pairs. What does this mean and what is an example?

• A) When one contracts, the other relaxes and this allows the bones to move; triceps and biceps.
• B) When one sarcomere contracts, the neighboring one relaxes; triceps and biceps.
• C) One is under conscious control and one is not; the diaphragm and ribs.
• D) There is always paired cartilage and muscle tissue; the knee joint.
• E) There are always paired tendons and ligaments; the hip joint.

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Definitions:

Relative Size

A comparison of the size of one object to another or to a reference, often used in various scientific contexts to provide a scale or proportion.

Muscle Action

The process of muscles contracting and relaxing to produce movement in various parts of the body.

Tropomyosin

A regulatory protein that wraps around actin filaments in muscle cells, playing a key role in muscle contraction by controlling access to binding sites for myosin.

Sarcomere

The basic contractile unit of muscle fiber, consisting of myofilaments.