Case Study
Topics may be associated with animals, microbes, genetics, technology, pollution, stress, etc. Documents can address physiological or anatomical consequences to the human body.
MUSCLES AND MUSCLE TISSUE
Types of Muscle Tissue
Skeletal, cardiac, smooth, Tab. 9.3
Skeletal Muscle
Fibers are elongated, attach to and cover bony
skeleton.
-Striated, adaptable, voluntary,
-Contract rapidly, foster mobility, requires rest,
has tremendous power.
Cardiac
Striated, heart wall bulk, involuntary
Contracts without stimulation, steady paced.
Smooth
In hollow organs- stomach, bladder, etc.
Form valves, dilate pupils, hair arrector pili
-Are elongated,
-not striated,
-and involuntary
Characteristics of Muscle Tissue
Excitability: Respond to stimulus
Contractibility: Shorten with stimulation
Extensibility: Extend (stretch)
Elasticity: Recoil after stretching
Muscle Functions
Movement: Contract/expand-locomotion- jump,
smile, frown, eye movement, etc.
CV pumps blood, GI tract, propel food, urinary,
reproductive (semen and babies)
Maintain Posture and Body Position: Adjust to
counteract gravity.
Stabilize joints: Strength and stability to jointsshoulder, hip, knee, etc.
Generate heat: Contract and expand maintain
temperature.
Skeletal Muscle Makeup
Each, an organ of fibers, blood vessels, nerve
fibers and connective tissue, Tab. 9.1.
Nerve and Blood Supply
Artery, vein and nerve serve muscles,
Control activity, transport O2, nutrient, remove
waste.