Types of Muscle Tissue

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4 Terms

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Skeletal muscle

Consists of long, cylindrical, striated fibers

→ Vary greatly in length & have multiple nuclei & mitochondria

Location: usually attached to bones via tendons
Function: motion, posture, heat production, & protection

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Cardiac muscle

Consists of striated, branching fibers

→ Typically has one nucleus but SOMETIMES has two nuclei

Join end-to-end via intercalated discs

→ Contain desmosomes (strengthen & hold fibers together during contractions) & gap junctions (facilitate quick conduction of electrical signals)

Location: Heart wall
Functions: Pumps blood to all parts of the body

<ul><li><p>Consists of striated, branching fibers</p></li></ul><p>→ Typically has one nucleus but SOMETIMES has two nuclei</p><ul><li><p>Join end-to-end via <strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">intercalated discs</mark></u></strong> </p></li></ul><p>→ Contain <strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">desmosomes</mark></u></strong> (strengthen & hold fibers together during contractions) & <strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">gap junctions</mark></u></strong> (facilitate quick conduction of electrical signals)</p><ul><li><p><strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">Location:</mark></u></strong> Heart wall </p></li><li><p><strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">Functions:</mark></u></strong> Pumps blood to all parts of the body </p></li></ul><p></p>

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Smooth muscle

Consists of non-striated, spindle-shaped fibers

→ Has one nucleus per cell, usually involuntary, usually connected by gap junctions

Functions: motion (constriction of blood vessels & airways, propulsion of food through the intestinal tract, & contraction of urinary bladder)
Location: Iris of the eyes; hollow walls of internal structures like blood vessels, airways to lungs, stomach, intestines, gallbladder, bladder, & uterus

<ul><li><p>Consists of <strong><u>non-striated,</u></strong> <strong><u>spindle-shaped</u></strong> fibers </p></li></ul><p>→ Has <strong><u>one nucleus</u></strong> per cell, usually involuntary, usually connected by <strong><u>gap junctions</u></strong> </p><ul><li><p><strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">Functions:</mark></u></strong> motion (constriction of blood vessels & airways, propulsion of food through the intestinal tract, & contraction of urinary bladder) </p></li><li><p><strong><u><mark data-color="yellow" style="background-color: yellow; color: inherit;">Location</mark></u></strong>: Iris of the eyes; hollow walls of internal structures like blood vessels, airways to lungs, stomach, intestines, gallbladder, bladder, & uterus </p></li></ul><p></p>

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Muscular tissue

Consists of elongated cells celled muscle fibers or myocytes
Use ATP to generate force
Produce body movements, maintains posture, provides protection, & generates heat