week 4 skeletal muscle

Question 1

what is the function of skeletal muscle

Answer 1

posture, breathing, force production , locomotion , endocrine organ, heat production

Question 2

muscles are attacheted to bones by what

Answer 2

tendons

Question 3

what is the epimysium

Answer 3

surrounds muscle

Question 4

what is the perimysium

Answer 4

surround the fascicles

Question 5

what is the endomysium

Answer 5

surrounds individual muscle fibres

Question 6

what is basement membrane

Answer 6

just below the endomysium

Question 7

what is sarcolemma

Answer 7

muscle membrane

Question 8

what is myofibrils

Answer 8

contains contractile proteins

Question 9

actin is what filament

Answer 9

thin

Question 10

myosin is which filament

Answer 10

thicccck

Question 11

what are the 5 sections of the sarcomere

Answer 11

Z LINE, H ZONE, A BAND, I BAN DAND M LINE

Question 12

What is transverse tubules

Answer 12

extend from the sarcolemma to the sarcoplasmic reticulum

Question 13

what is a satellite cell

Answer 13

cells help with growth and repair- increase nuclei in mature muscle fibres

Question 14

what is the myonuclear domain

Answer 14

the volume of sarcoplasm surrounding nucleus

Question 15

the more myonuclei means

Answer 15

more protein synthesis

Question 16

muscle hypertrophy means a what in myonuclei

Answer 16

increase

Question 17

how are skeletal muscles made

Answer 17

myoblasts fuse together

Question 18

what is the NMJ made of

Answer 18

motor neuron and muscle fiber and motor end plate

Question 19

what is the NM cleft

Answer 19

the gap between the muscle fiber and the neuron

Question 20

what is ACETYL COA

Answer 20

a NT released from the motor neuron and depolarizes the muscle fibre for muscle contraction

Question 21

how many muscle in the human body

Answer 21

600

Question 22

why is the myonuclear domain important

Answer 22

the nucleus is responsible for gene expression in sarcoplasm

Question 23

motor neurons come from where

Answer 23

the spinal cord and innverate muscle fibres

Question 24

what part shortens during the sldiing filament

Answer 24

Z LINE AND SARCOMERE

Question 25

Myosin attaches to where

Answer 25

actin on the thin filament

Question 26

the release of atp causes what

Answer 26

the powerstroke

Question 27

3 sources of atp

Answer 27

phosphocreatine, glycolysis, oxidative phosphorylation

Question 28

what percentage average does a muscle shorten by

Answer 28

1%

Question 29

what is the contracted mediated by

Answer 29

calcium

Question 30

what is fatigue

Answer 30

a decline is power output

Question 31

what causes fatigue

Answer 31

decrease in force production at cross bridge or and decrease in muscle shortening velocity

Question 32

fatigue is effected by the type of exercise

Answer 32

true

Question 33

1-10 intense exercise fatigue caused by what 2 things

Answer 33

lack of calcium release from SR, accumulation of metabolites

Question 34

example of metabolites

Answer 34

pi, H+ and free radicles

Question 34

what do pi and free radicles do

Answer 34

modify cross bridge reducing bridges bound to actin

Question 35

what do h+ do

Answer 35

bind calcium binding sites on troponin , preventing calcium binding and contraction

Question 35

causes of fatigue moderate intensity exercise

Answer 35

radicles, glycogen depletion, metabolites,

Question 35

depletion of glycogen causes a decrease in what

Answer 35

ATP

Question 36

does hydration and electrolytes impact EAMS

Answer 36

no

Question 36

what is EAMS

Answer 36

exercise assosisated with muscle cramps

Question 36

what is EAMS caused by

Answer 36

long high intensity exercise

Question 36

what can is EAMS caused by

Answer 36

repeated electrical stimulation from hyper active motor neurons from the spinal cord

Question 36

what can help EAms

Answer 36

STATIC STRETCHING