Term
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Definition
move body parts
maintain body posture
adjust the volume of hollow structures (bladder, blood vessels)
move substances within the body
produce heat |
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Term
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Definition
Location- attached to bones
Appearances- long, cylindrical fibers, thin, striated, multiple nuclei
control- voluntary
contraction- rapid contraction and relaxation
fatigue?- yes |
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Term
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Definition
location- heart
appearance- branching cylindrical fibers, striated, single nucleus
control- voluntary
contraction- moderate
fatigue?- no |
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Term
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Definition
location- walls of blood vessels, visceral organs
appearance- small cells, sometimes branched, not striated, single nucleus
control- involuntary
contraction- slow; can maintain for extended periods
fatigue?- no |
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Term
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Definition
immature muscle cells
several of these fuse together to produce each skeletal muscle fiber |
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Term
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Definition
adult muscle cells
cannot divide
can be activated by exercise, injury, or disease to produce new myoblasts that fuse to form new muscle fibers |
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Term
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Definition
cell membrane
contains cell's contents and shields cell from extracellular environment (important in muscle contraction) |
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Term
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Definition
tunnels deep into the interior of the muscle fiber
action potential travels down these, which enable them to reach every part of the fiber virtually simultaneously to trigger a coordinated muscle contraction |
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Term
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Definition
slender, thread-like organelles that accomplish the work of muscle contraction
each is a bundle of different proteins that runs the entire length of the muscle fiber
each muscle fiber contains hundreds or thousands of these |
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Term
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Definition
a lacy network of fluid-filled tubules similar to the SER
stores calcium ions necessary for muscle contraction |
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Term
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Definition
| generate ATP that fuels muscle contraction |
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Term
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Definition
| sheath of connective tissue that covers, insulates, supports, and protects skeletal muscles |
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Term
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Definition
| thicker, tougher sheath of connective tissue |
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Term
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Definition
touch and very substantial outer layer of connective tissue that covers groups of fascicles that form muscles
binds together to form a strong collagenous tissue that attaches muscle to bone |
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Term
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Definition
| comprises a somatic motor neuron and the skeletal muscle fibers it controls |
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Term
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Definition
when a single synaptic bulb meets a skeletal muscle fiber at a chemical synapse
components: synaptic bulb of a neuron, the motor end plate of the muscle fiber, the synaptic cleft |
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Term
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Definition
| every skeletal neuromuscular junction uses this neurotransmitter |
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