Chapter 9: Cody Study Guide

Front

Muscle fibers in a skeletal muscle form bundles called?

Back

Fascicles

Front

What explains the length-tension relationship of skeletal muscles?

Back

The forcefulness of the muscle contraction depends on the length of the sarcomeres within a muscle before the contraction occurs.

Front

At what age does sarcopenia generally begin?

Back

After 50 years of age.

Front

What molecule is responsible for the coupling of excitation of the fiber membrane to the muscle contraction?

Back

Calcium.

Front

Muscle tone increases as which of the following increases?

Back

Strength.

Front

What is the basic unit of contraction in skeletal muscle?

Back

Sarcomere.

Front

What role does calcium play in muscle contraction?

Back

Calcium ions trigger the interaction between actin and myosin, leading to muscle contraction.

Front

What is the primary protein found in muscle fibers that facilitates contraction?

Back

Myosin.

Front

What is the function of the endomysium in skeletal muscle?

Back

The endomysium surrounds individual muscle fibers, providing support and insulation.

Front

What is the difference between isotonic and isometric contractions?

Back

Isotonic contractions involve muscle shortening with movement, while isometric contractions involve muscle tension without shortening.