Muscle Histology

Question 1

muscle fiber

Answer 1

aka muscle cell, are packed within fascicles

Question 2

fascicle

Answer 2

collection of muscle tissue arranged in various orientations
muscle cells packed within
have a perimsiem CT wrapping

Question 3

origin

Answer 3

immovable/fixed
bone that is proximal to the joint

Question 4

insertion

Answer 4

bone that is distal to the joint
becomes moveable during muscle contraction

Question 5

tendon

Answer 5

attaches muscle to bone

Question 6

aponeurosis

Answer 6

thin sheet of CT that connects muscles to bones

Question 7

endomysium

Answer 7

CT covering on outside of of the muscle fiber

Question 8

perimysium

Answer 8

CT wrapping around fasicles

Question 9

epimysium

Answer 9

CT wrapping around the whole muscle (group of fasicles)

Question 10

sarcolemma

Answer 10

cell membrane around muscle cell

Question 11

sarcoplasma

Answer 11

cytoplasm of muscle cells

Question 12

sarcoplasmic reticulum

Answer 12

ER of muscle cell, stores calcium
CA from the bone matrix chewed by osteoclasts

Question 13

t tubules

Answer 13

sarcolemma invaginates into cell and creates tunnels impulse to travel through

Question 14

triad

Answer 14

t-tubles and sarcoplasmic ER

Question 15

myofibrils

Answer 15

elongated threads in the muscle cells, cause striation

Question 16

myofilaments

Answer 16

proteins which cause contraction within the myofibril

Question 17

thin filaments

Answer 17

actin, tropomyosin, troponin

Question 18

actin

Answer 18

bowling ball

Question 19

troponin

Answer 19

lint

Question 20

tropomyosin

Answer 20

duct tape

Question 21

thick filaments

Answer 21

myosin

Question 22

myosin

Answer 22

stuck between thin filaments
heads face up to thin filaments
pull thin filaments to cause overlap

Question 23

z disk

Answer 23

anchors the thin filaments

Question 24

a band

Answer 24

thick filaments

Question 25

i band

Answer 25

thin filaments

Question 26

h zone

Answer 26

Overlap of thick and thin filaments

Question 27

sarcomere

Answer 27

Z line to z line

Question 28

motor neuron

Answer 28

sends chemical impulses called ligands to the motor end plate

Question 29

neuromuscular junction

Answer 29

where motor end plate and motor neuron meet
communication between nerve and muscle cell

Question 30

motor end plate

Answer 30

location where motor neuron releases ligands, triggering muscle impulse throughout the cell, release of calcium, and contraction

Question 31

contraction steps

Answer 31

1- motor neuron releases neurotransmitter at neuromuscular junction
2- NT bonds to receptor and muscle impulse begins
3- runs around sarcolemma
4- internalizes muscle impulse by t tubules
5- shakes up SR
6- release of CA which will bind to troponin
7- causes tropomyosin to peel off
8- exposes myosin binding sites on actin, myosin binds and pulls the thin filaments together
9-ATP causes z lines to come together
11- sarcomeres shorten… entire muscle shortens

Question 32

motor unit

Answer 32

motor neuron and all muscle fibers is can ignite by sending a ligand