Muscles

Question 1

Contractility

Answer 1

Muscle tissue contracts forcefully

Question 2

Excitability

Answer 2

Nerve signals or other stimuli excite muscle cells, causing electrical impulses to travel along the cells plasma membrane.

Question 3

Extensibility

Answer 3

Muscle tissue can be stretch

Question 4

Elasticity

Answer 4

After being stretched, muscle tissue recoils passively and resumes its resting length.

Question 5

Functions of the Muscular system

Answer 5

Produce movement, open and close body passageways, maintain posture and stabilize joints, and generate heat.

Question 6

Skeletal Muscle

Answer 6

Attached to bones or to skin. Single, very long cylindrical, multinucleated cells with obvious striations.

Question 7

Cardiac Muscle

Answer 7

Walls of the heart. Branching chains of cells; uni- or binucleate; striations

Question 8

Smooth Muscle

Answer 8

Mostly in walls of hollow organs, such as the stomach, respiratory tubes, bladder, blood vessels, and uterus. Single, fusiform, uninucleate; no striations.

Question 9

Aponeurosis

Answer 9

The connective tissue extends well beyond the end of the muscle fibers to form either a cordlike tendon or a flat sheet

Question 10

Epimysium

Answer 10

An outer layer of dense, irregular connective tissue surrounds the whole skeletal muscle.

Question 11

Perimysium

Answer 11

Within each skeletal muscle, the mucle fibers are separated into groups. Those are called fascicles, the layer of fibrous connective tissue is perimysium.

Question 12

Endomysium

Answer 12

Within a fascicle, each muscle fiber is surrounded by a fine sheath of loose connective tissue consisting mostly of reticular fibers.

Question 13

Motor unit

Answer 13

A motor neuron and all the muscle fibers in a skeletal muscle.