Anatomy and Physiology Study Set 1

Endomysium separates individual muscle fibers from each other.

An isotonic contraction is one that involves a change in length but not a change in tension.

In the initiation ofmuscle contraction, calcium ions bind totropomyosin, exposing active sites on actin for cross-bridge formation.

The enzyme ATPase is located in the heads of myosin molecules.

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

ATP is necessary for muscle relaxation.

Cardiac muscle is located in the walls of blood vessels.

The muscle most responsible for a particular movement is called the prime mover or antagonist.

Troponin, tropomyosin and actin are all parts of the thin filaments.

Acetylcholinesterase breaks down the cross-bridge linkages between myosin to actin.

During the process of glycolysis, the breakdown of one glucose molecules results in production of two ATP molecules.

Muscle fatigue results from a combination of insufficient calcium and an excessof acetylcholine.

If frequency of stimulation to a muscle fiber is increased, the force of contraction will increase.

Recruitment refers to increasing the number of motor units involved in a muscle contraction.

Intercalated discs are found in skeletal muscle and cardiac muscle, but are not present in smooth muscle.

Endomysium separates individual muscle fibers from each other.

An isotonic contraction is one that involves a change in length but not a change in tension.

In the initiation ofmuscle contraction, calcium ions bind totropomyosin, exposing active sites on actin for cross-bridge formation.

The enzyme ATPase is located in the heads of myosin molecules.

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.