Muscle system

Question 0

Skeletal muscle

Answer 0

• is coluntary and striated; makes up approximately 40% of the body mass; and functions to produce movement of the body, generate bodyheat and maintain body posture.
• had two attachments, an orgin ( which is usually the more fixed and proximal attachment) and an insertion (which is the more movable and distal attachment).
• is enclosed by perimysium. Each muscle fiber is enclosed by endomysium.

Question 1

Muscle

Answer 1

Consists predominantly of contractile cells, produces the movements of various parts of the body by contraction, and occour in three types:
• skeletal
• cardiac
• smooth

Question 2

Cardiac Muscle

Answer 2

• is involuntary and strated and dorma the myocardium, the middle layer of the heart.
• is innervated by the autonomic nervous system but contracts spontaneously without any nerve supply.
• includes specialized myocardical fibers that forms the cardic conduction system.

Question 3

Smooth Muscle

Answer 3

• is involuntary and nonstriated and generally arranged into two layers, circular and longitudinal, in the walls of many visceral organs.
• is innervated by the autonomic nervous system, regulating the size of the lumen of a tubular structure.
• undergoes rhythmic contractions calles peristaltic waves in the wall of the gastrointestinal (GI) tract, uterine tubes, ureters and other organs.