Smooth Muscle Flashcards
What is the capacity of muscle to respond to a stimulus?
excitability
What is the ability of a muscle to shorten and generate pulling force?
contractility
What is the ability of a muscle to be stretched back to its original length?
extensibility
What is the ability of a muscle to recoil to original resting length after stretched?
elasticity
What type of muscle is found in the walls of hollow organs and tubes?
smooth
Does smooth muscle have striations?
nope
Do smooth muscle filaments form myofibrils?
Nah
Are smooth muscles arranged in sarcomere pattern like skeletal muscle?
No
How is smooth muscle shaped?
spindle-shaped
True or False? Smooth muscle has dense bodies containing the same protein found in Z lines.
True
What is the dense regular connective tissue surrounding entire muscle?
epimysium
What are collagen and elastic fibers surrounding a group of muscle fibers called a fascicle?
perimysium
What are loose connective tissue that surround individual muscle fibers?
endomysium
True or False? Collagen fibers of epimysium, perimysium, and endomysium come together at each end of muscle to form a tendon or aponeurosis.
true
_____ is nonstriated and does involuntary, slow, wave-like contractions.
Smooth muscle
Fibers in smooth are _____ than those in skeletal muscle.
smaller
True or False? Smooth muscle has more myosin than actin.
False. Smooth muscle has more actin than myosin.
What are indentations in sarcolemma?
caveolae
What are the two layers of sheets of smooth muscle?
longitudinal layer
circular layer
Smooth muscle is innervation by what system?
ANS
Impulses spread through gap junctions in what type of smooth muscle?
visceral or unitary smooth muscle
Which type of smooth muscle is often autorhythmic?
visceral or unitary smooth muscle
