a&p review 14

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microscopic anatomy and organization of skeletal muscle.

perimysium

connective tissue ensheathing a bundle of muscle cells.

fascicle

bundle of muscle cells.

sarcomere

contractile unit of muscle.

myofibril

muscle cell

endomysium

thin reticular connective tissue surrounding each muscle cell.

sarcoplasm

plasma membrane of muscle fiber.

fiber

a long filamentous organelle with a banded appearance found within muscle cells.

myofilament

actin or myosin containing structure

tendon

cord of collagen fibers that attaches muscle to bone.

list three reasons why the connective tissue wrappings of the skeletal muscle are important.

supporting and binding the muscle fibers, providing strength to the muscle as a whole and to provide a route for the entry and exit of nerves and blood vessels that serve the muscle fibers.

why are there more indirect- that is, tendinous- muscle attachmens to bone than there are indirect attachments?

they can span rough bony prominences that would destroy the more delicate muscle tissues and because of their relatively small size, more tendons than muscles can pass over joints.

how does an aponeurosis differ from a tendon structurally?

tendons are strong and cord-like and attach muscle to bone; aponeurosis are sheet-like and attach muscle to muscle.

the junction between a motor neuron's axon and the muscle cell membrane is called?

neuromuscular junction

a motor neuron and all of the the skeletal muscle cells it stimulates is called a

motor unit

the actual gap between the axon terminal and the muscle cell is called a

synaptic cleft

within the axon terminal are many small vesicles containing a neurotransmitter substance called

Ach- acetylcholine

when the _____ reaches the ends of the axon, the neurotransmitter is released and diffuses to the muscle cell membrane to combine with receptors there.

nerve impulse

the greater influx of sodium ions results in ______ of the membrane. Then contraction of the muscle cell occurs.

permeability

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