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Exercise 14: Microscopic Anatomy and Organization of Skeletal Muscle

front 1

perimysium

back 1

connective tissue ensheathing a bundle of muscle cells.

front 2

fascicle

back 2

bundle of muscle cells.

front 3

sarcomere

back 3

contractile unit of muscle.

front 4

myofibril

back 4

muscle cell

front 5

endomysium

back 5

thin reticular connective tissue surrounding each muscle cell.

front 6

sarcoplasm

back 6

plasma membrane of muscle fiber.

front 7

fiber

back 7

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

front 8

myofilament

back 8

actin or myosin containing structure

front 9

tendon

back 9

cord of collagen fibers that attaches muscle to bone.

front 10

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

back 10

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.

front 11

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

back 11

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.

front 12

how does an aponeurosis differ from a tendon structurally?

back 12

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

front 13

how is an aponeurosis functionally similar to a tendon?

back 13

Aponeuroses are thick membranes that separate muscles from one another. They are tough and resilient. Tendons are similar, in both function and composition, only they serve to connect muscles to bones. Both aponeuroses and tendons are capable of resisting considerable tension.

front 14

back 14

front 15

back 15

front 16

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

back 16

neuromuscular junction

front 17

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

back 17

motor unit

front 18

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

back 18

synaptic cleft

front 19

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

back 19

Ach- acetylcholine

front 20

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

back 20

nerve impulse

front 21

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

back 21

permeability

front 22

back 22

front 23

back 23