Smooth Muscle (Non-striated, Involuntary)

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Slower but able to sustain contraction longer than striated muscle?

Calmodulin

What is the binding protein that is used by smooth muscle during contraction?

Calmodulin

maintains constant state of weak, partial contraction called tonus (does not relax completely under normal conditions)?

Tonic

Has one nerve to large numbers of fibers.Fibers respond to hormones, and stretch as well as nerve?

Unitary (Visceral) smooth muscle

What type of smooth muscle is the most; occurs in sheets and walls of hollow tubes & organs (ie. GI tract, blood vessels, uterus, ureters, etc.)?

Unitary (Visceral) smooth muscle

What is the common shape of smooth muscle cells?

spindle shape, taper at the ends

What is the structure that releases neurotransmitters in a unitary smooth muscle cell?

varicosities

During contractions, what is being pulled on of neighboring smooth muscle cells?

basil lamina

What enters into the caveolae of the smooth muscle cells?

Calcium

What is the ratio of actin/ myosin in smooth muscles?

12/1

What is the ANS regulation of smooth muscle contraction?

Ach and Ne

What are dense bodies made up of?

Alpha-actinin

What type of muscle has no capacity for regeneration, replaced with connective tissue scar?

Cardiac muscle

What are the little dips on the outside membrane of smooth muscle cells?

Caveolae

What do thin/thick filaments attach to and shorten during contraction?

Dense bodies

What are the two types of smooth muscle?

Multi-unit and Unitary (Visceral)

Smooth muscle type that is rare, needs innervation to function properly and has a motor unit (nerve/muscle ratio) approaching = 1.0?

Multi-unit smooth muscle

Does the sarcoplasmic reticulum (SER) of smooth muscle store a lot of calcium like skeletal muscle?

No, does not store as much

What is an example of a multi-unit smooth muscle?

Pupillary muscles of eye

contracts periodically in waves ie. peristalsis?

Rhythmic

What are the two types of unitary smooth muscle?

Rhythmic and tonic

What kind of tissue doesn't conduct electricity?

Scar tissue

What type of muscle has a poor capacity to regenerate new muscle. Comes from satellite cells that can act as myoblasts. Extremely limited?

Skeletal muscle

What type of muscle regenerates well, has great potential for renewal and repair?

Smooth muscle

occurs singly or in groups (sheets and bundles) with ct. (elastic, & retic) surrounding cells?

Smooth muscle cells

What does the structure of smooth muscle lack? Instead, what do they have?

T-system and intercalated discs Subsacrolemmal caveolae

Does smooth muscle cell use Ca++ for contraction like skeletal muscle?

Yes

Does smooth muscle have actin and myosin? Does smooth muscle have sarcomeres?

Yes No

What are dense bodies similar to?

Z-lines

When a smooth muscle contracts, what kind of nucleus do we have?

a pleated, corkscrew nucleus

What kind of cytoplasm is within a smooth muscle cell? What kind of nucleus?

eosinophilic cytoplasm basophilic, ovoid nucleus

Actin and myosin filaments are in what kind of bundles in smooth muscles?

longitudinal and parallel bands


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