Chapter 6 - The Muscular System
Quiz 2
In general, skeletal muscle insertion is immovable · False · Smooth muscle fibers are long, tapering,
1
,↑ Chapter 6 - The Muscular System
Part A
Muscles are responsible for all types of body movement
Three basic muscle types are found in the body
Skeletal muscle
Most skeletal muscle fibers are attached by tendons to bones · Skeletal muscle cells are large,
Cardiac muscle
Striations · Involuntary · Found only in the walls of the heart · Uninucleate (can have more than
Smooth muscle
No striations · Involuntary: No conscious control · Found mainly in the walls of hollow visceral or
Skeletal and smooth muscle cells are elongated (muscle cell = muscle fiber)
Contraction and shortening of muscles are due to the movement of microfilaments
All muscles share some terminology
Prefixes myo- and mys- refer to “muscle”
Prefix sarco- refers to “flesh”
2
,3
, ↑ Part A
Skeletal muscle
Most skeletal muscle fibers are attached by tendons to bones
Skeletal muscle cells are large, cigar-shaped, and multinucleate
Also known as striated muscle because of its obvious stripes
Also known as voluntary muscle because it is the only muscle tissue subject to
conscious control
Skeletal muscle cells are surrounded and bundled by connective tissue
Endomysium: Encloses a single muscle fiber
Perimysium: Wraps around a fascicle (bundle) of muscle fibers
Epimysium: Covers the entire skeletal muscle
Fascia: On the outside of the epimysium
The epimysium of skeletal muscle blends into a connective tissue attachment
Tendons: Cordlike structures
Mostly collagen fibers
Often cross a joint because of their toughness and small size
4
Quiz 2
In general, skeletal muscle insertion is immovable · False · Smooth muscle fibers are long, tapering,
1
,↑ Chapter 6 - The Muscular System
Part A
Muscles are responsible for all types of body movement
Three basic muscle types are found in the body
Skeletal muscle
Most skeletal muscle fibers are attached by tendons to bones · Skeletal muscle cells are large,
Cardiac muscle
Striations · Involuntary · Found only in the walls of the heart · Uninucleate (can have more than
Smooth muscle
No striations · Involuntary: No conscious control · Found mainly in the walls of hollow visceral or
Skeletal and smooth muscle cells are elongated (muscle cell = muscle fiber)
Contraction and shortening of muscles are due to the movement of microfilaments
All muscles share some terminology
Prefixes myo- and mys- refer to “muscle”
Prefix sarco- refers to “flesh”
2
,3
, ↑ Part A
Skeletal muscle
Most skeletal muscle fibers are attached by tendons to bones
Skeletal muscle cells are large, cigar-shaped, and multinucleate
Also known as striated muscle because of its obvious stripes
Also known as voluntary muscle because it is the only muscle tissue subject to
conscious control
Skeletal muscle cells are surrounded and bundled by connective tissue
Endomysium: Encloses a single muscle fiber
Perimysium: Wraps around a fascicle (bundle) of muscle fibers
Epimysium: Covers the entire skeletal muscle
Fascia: On the outside of the epimysium
The epimysium of skeletal muscle blends into a connective tissue attachment
Tendons: Cordlike structures
Mostly collagen fibers
Often cross a joint because of their toughness and small size
4
