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18 Cards in this Set

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  • Back
What are muscles called and why are they called this?
the machines of the body because they do all of the body's work
What are muscles functions?
they provide movement by contracting and relaxing

muscles maintain posture by attaching themselves to bones and holding them up and moving them

to generate body heat by moving
How do muscles work?
they tend to work in pairs. one muscle contracts while the other relaxes.
What are the three types of muscles?
skeletal
cardiac
smooth
Where are skeletal muscle tissues found? Do they have striations? Are they voluntary?
found in the muscles that are attached to bones

have striations

is voluntary
Where are cardiac muscle tissues found? Do they have striations? Are they voluntary?
found only in the heart

have striations

is involuntary
Where are smooth muscle tissues found? Do they have striations? Are they voluntary?
found in the walls of hollow organs (stomach, urinary bladder, respiratory passage)

have striations

is involuntary
What are skeletal muscles composed of?
skeletal muscle tissue, nervous tissue, connective tissue, and blood
What is a fascia?
a layer of fibrous connective tissue that surrounds each muscle
What is the epimysium?
another tough layer of connective tissue under the fascia that surrounds the muscle fibers; surrounds a skeletal muscle
What is a perimysium?
a layer of connective tissue that separates the muscle fibers into small compartments or bundles
What are fascicles?
bundles of muscle cells (fibers)
What is an endomysium?
a thin layer of connective tissue that surrounds each muscle fiber
What is a skeletal muscle fiber?
a long cylinder shaped cell that contracts in response to stimulation and relaxes when it's over
What is a myofibril?
bundles of rodlike filaments which makes up a fiber
What are myofibrils composed of?
alternating light and dark filaments called myosin (thick)and actin (thin)
What are myofiliments?
light and dark filaments
What is a tendon?
a cordlike part that attaches a muscle to a bone