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Part III: Muscle Tissue
3 types: Skeletal muscle Cardiac muscle Smooth muscle
Skeletal Muscle Description:
Long, cylindrical Multinucleate (2+ nuclei) Striated (banded appearance)
Function: Muscles contract, pull on bones or skin
cause body movements Location in the body:
Attached to skeleton Other features:
Voluntary control
Cardiac Muscle Description:
Striated Uninucleate (1 nucleus) Branching cells – fit at junctions called intercalated
discs Function:
Propel blood through blood vessels to all parts of body
Locations in the body: Walls of the heart
Other features: Involuntary control
Smooth Muscle Description:
No visible striations 1 central nucleus Spindle-shaped (pointed ends)
Function: Propel substances through hollow organs
Locations in the body: Walls of organs (stomach, bladder, uterus, blood vessels)
Other features: Involuntary control Contracts slowly Peristalsis: wavelike motion that moves food through SI