Objective 5.5. Muscular tissue (differences between skeletal, cardiac, and smooth muscle) Muscle Tissue
Skeletal Muscle
attaches to bone allowing the skeleton to move
Voluntary action
We consciously contract our muscles
e.g., when we move pull our hand away from a hot stove
Skeletal muscles are long, slender muscle fibers with visible striation
Parallel to one another
Multinucleate
Cells have more than one nucleus
Smooth Muscle
located in the walls of hallow organs
i.e., the stomach and intestines
Involuntary action
We do not consciously control them
e.g., we don’t have to tell our stomach to move food along the digestive system, it moves on its own.
Spindle-shaped fibers with tapered ends
No visible striations
uninucleate (single nucleus)
Overlapping pattern creates sheets, layers, and rings of muscle
Cardiac Muscle
located in heart wall
Involuntary action
We don’t tell our heart to beat, it just beats
branched, striated fibers
uninucleate
Cells are connected with intercalated discs
These discs allow calls to communicated rapidly
Important so fibers contract as a single unit
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