Dynamics of smooth muscle contraction

LEARNER OBJECTIVES

Distinguish between the physical characteristics of smooth muscle, skeletal muscle and cardiac muscle

Contrast multiunit smooth muscle and visceral smooth muscle as to location in the human body, characteristics of innervation and function.

Be able to discuss the initiation of visceral smooth muscle contraction by “pacemaker” ionic changes, nerve impulses (neurotransmitters), hormones and local tissue factors

Demonstrate knowledge of the length-tension relationship of visceral smooth muscle
Identify two more neurotransmitters to smooth muscle


CLASSES OF MUSCLE

Striated muscle: multinucleated fibers (by fusion), peripheral nucleus, organized sarcomere arrangement (striations), voluntary, rapid acting, and relatively easily fatigued, for locomotion - movement (skeletal).

Smooth muscle: single centrally located nucleus, no repeated arrangement (no striations), slow contracting, involuntary visceral contractions (eg: peristalsis).

Cardiac muscle: single centrally located nucleus, "striated involuntary muscle,"only in the heart, branching interconnections (syncitium), initiates rhythmic contraction intrinsically.


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dr khaled Abulfadle