Exam 8: The Muscular System

A useful byproduct of skeletal muscle contraction is heat.

In a myogram of a twitch contraction, this period could be described as an upward deflection reflecting an increase in the force of contraction of the muscle.

Which of the following is a muscle whose insertion is found on the pectoral girdle?

The name of the muscle labeled B in the diagram and responsible for the "six-pack" appearance of a well-trained abdomen is the

Acetylcholine that has been released into the synaptic cleft is rapidly inactivated by

The myofibrils of skeletal muscle fibers are composed of three types of filaments.

Intercalated discs are characteristic structures found in

Which of the following substances can block the release of acetylcholine at a neuromuscular junction?

Which of the following is a muscle that moves the foot?

During the recovery-oxygen-uptake period that follows vigorous physical activity, some of the lactic acid produced by anaerobic respiration in skeletal muscle fibers is converted into glycogen in the

Which of the following labeled muscles in the diagram is not part of the quadriceps femoris muscle group?

A motor unit in a skeletal muscle is defined as all the

During skeletal muscle contraction, the myosin heads pull on actin causing the thin filaments to slide toward the center of the sarcomere.

The organelle that stores calcium in a resting skeletal muscle fiber is the

There are two types of smooth muscle tissue called visceral and multiunit.

Each individual muscle fiber is covered by a layer of connective tissue called the

Smooth muscle is

The darker portion of the sarcomere composed of thick filaments and in some areas overlapping thin filaments is called the

A sustained contraction of a muscle is called

The detachment of myosin heads from actin requires ATP.