ch 10

Question 1

how much muscle constitutes your body weight

Answer 1

half

Question 2

types of muscle

Answer 2

skeletal, cardiacs, smooth

Question 3

muscle purpose

Answer 3

converting chemical energy in atp into mechanical energy of motion

Question 4

myology

Answer 4

study of muscular system

Question 5

muscle funcitons

Answer 5

movement, stability, control of openings and passageways, heat production, glycemic control

Question 6

muscle role in body movement

Answer 6

breathing, circulation, digestion

Question 7

muscle role in stability

Answer 7

maintains posture by preventing unwanted movement
stabilize joints

Question 8

control of opening and pathways

Answer 8

sphincter in esophagus to yeaaa

Question 9

heat production by muscles make up- of our body heat

Answer 9

85%

Question 10

glycemic control

Answer 10

absorb and store glucose which helps regulate blood sugar concentration withing normal range

Question 11

skeletal muscle

Answer 11

voluntary striated muscle usaly attached to bones

Question 12

striation

Answer 12

alternating light and dark transverse bands
a result of internal conrtactile proteins

Question 13

myofiber/ muscle cell

Answer 13

muscle fiber
can be 30 cm
can never divide (bc multinucelated)

Question 14

endomysium

Answer 14

between rows of muscle fibers

Question 15

sarcolemma

Answer 15

plasma membrane of muscle

Question 16

transverse tubules

Answer 16

extension of the sarcolemma into cell, inbetween the shit like fibers

Question 17

sarcoplasm (basically cytoplasm) is made of

Answer 17

myofibrils
glycogen
myoglobin

Question 18

myofibrils

Answer 18

bundles of myofilaments (these contract)

Question 19

glycogen

Answer 19

storage of glucose

Question 20

myoglobin

Answer 20

storage protein in muscle for oxygen!!

Question 21

sarcoplasmic reticulum

Answer 21

stores/releases intracellular calcium
basically smooth endoplasmic reticulum

Question 22

terminal cisternae

Answer 22

dilated end sacs of the SR

Question 23

traid

Answer 23

a T-tubule surrounded by 2 terminal cisternae
kinda criss cross

Question 24

myosin

Answer 24

thick filaments- will do the pulling for the

Question 25

actin

Answer 25

thin filaments

Question 26

fibrous actin

Answer 26

2 intertwined strands

Question 27

globular actin

Answer 27

resembles one bead of necklace
has the active site for mysosin binding site

Question 28

actin and mysoin act together to

Answer 28

contract

Question 29

tropomyosin

Answer 29

covers active site on actin to stop contractions

Question 30

troponin

Answer 30

binds calcium and moves tropomyosin

Question 31

elastic filaments

Answer 31

titin anchors thick filaments

Question 32

sarcomere

Answer 32

smallest functional group of muscle
from z disc to z disc

Question 33

a bands (dark)

Answer 33

anisotropic
entire length of thick filament!!
doesnt move rlly!!!

Question 34

h band

Answer 34

bare zone in middle of a band

Question 35

I band

Answer 35

isotropic
bare zone of thin filaments- light
on the outside of the a band

Question 36

motor unit

Answer 36

one motor neuron and multiple muscle fibers

Question 37

small motor unit

Answer 37

small number, precise movements

Question 38

large motor unit

Answer 38

stronger, large muscle number, less precise

Question 39

steps of contraction

Answer 39

1 excitation
2 excitation-contraction coupling
3 contraction
4 relaxation

Question 40

excitation

Answer 40

action potential from neuron lead to muscle action potential

Question 41

excitation contraction

Answer 41

calcuim is released inot sarcoplasm, tropomyosin moves off site

Question 42

contraction

Answer 42

muscle fiber tenses and myosin head pulls on actin to shorten

Question 43

relaxation

Answer 43

returns to resting length

Question 44

cardiac muscle

Answer 44

Striated, uninucleate,
branching, involuntary

Question 45

smooth muslce

Answer 45

uninulceated
not striated
involuntary

Question 46

skeletal muscles

Answer 46

straiated, tubular, multinucleated,