Skeletal muscle study guide

Question 1

epimysium

Answer 1

a sheath of fibrous elastic tissue surrounding a muscle

Question 2

perimysium

Answer 2

the connective tissue that surrounds fasicles

Question 3

fasiculi

Answer 3

bundles of muscle fibers

Question 4

endomysium

Answer 4

connective tissue surrounding a muscle fiber

Question 5

sarcolema

Answer 5

plasma membrane of a muscle cell

Question 6

transverse tubules

Answer 6

provide channels for ion flow throughout the muscle fibers to facilitate the propogation

Question 7

sarcoplasmic reticulum

Answer 7

specialized endoplasmic reticulum of muscle cells

Question 8

sarcoplasm

Answer 8

cytoplasm of a muscle cell

Question 9

myosin

Answer 9

the contractile protein that makes up the thick filaments

Question 10

actin

Answer 10

the contractile protein that makes up the thin filaments

Question 11

sacromeres

Answer 11

contractile units within myofibrils the smallest contractile unit of a muscle

Question 12

motor neuron

Answer 12

a neuron that sends an impulse to a muscle or gland causing it to react

Question 13

motor unit

Answer 13

a single motor neuron and all the skeletal muscle fibers it supplies

Question 14

neuromuscular junction

Answer 14

where a motor neuron and muscle fiber meet

Question 15

acetylcholine

Answer 15

neurotransmitter that stimulates muscle fibers

Question 16

acetylcholinesterase

Answer 16

enzymes that break down Ach.

Question 17

muscle twitch

Answer 17

contraction of a muscle fiber in response to a stimulus, usually involves all fibers in a motor unit

Question 18

summation

Answer 18

force of contraction is increased by rapid stimulation

Question 19

recruitment

Answer 19

by increasing the number of motor units stimulated it increases the number of muscle fibers contracted

Question 20

name 4 function of the muscular system

Answer 20

1.movement of the body
2.maintanence and posture
3.respiration
4. communication