Muscle

Question 1

the contractile organelles of skeletal muscle fiber are ________, which are composed of repeating units called _________

Answer 1

myofibrils, sarcomeres

Question 2

skeletal mm contraction is triggered to begin when calcium is released from

Answer 2

terminal cisterns of sarcoplasmic reticulum

Question 3

which region of a sarcomere contain thin filaments

Answer 3

both I and A band

Question 4

myofibrils does NOT contain which type of proteins

Answer 4

tensile proteins

Question 5

which function do all 3 muscles perform

Answer 5

moving and storing material throughout the body

Question 6

the outermost layer of connective tissue surrounding a skeletal mm is the

Answer 6

epimysium

Question 7

what characteristics describe both skeletal and cardiac muscle

Answer 7

striations

Question 8

after the fusion of myoblasts, the muscle fiber loses its ability to

Answer 8

go through mitosis

Question 9

sequence of structures that action potentials move through to excite skeletal mm contraction

AST

Answer 9

axon of neurons
sarcolemma
T-tubules

Question 10

which protein is used to reinforce the sarcolemma and help transmit the tension generated by the sarcomeres to the tendons

Answer 10

tropomyosin

Question 11

for crossbridges to occur, what events must happen

ACM

Answer 11

ATPase breaks down ATP
calcium ions be present in sarcoplasm
myosin binding sites be exposed

Question 12

at the neuromuscular junction _____ must enter the synaptic end bulb to stimulate the release of _____ which binds to ligand gates so ____ can enter the muscle fiber

Answer 12

calcium ions, ACh, sodium ions

Question 13

which ATP production would be sufficient to run in place for one minute

Answer 13

anaerobic cellular respiration

Question 14

why would cardiac muscles have longer refractory periods then skeletal mms

Answer 14

to preserve the normal rhythm of the heart and prevent fatigue

Question 15

world class shot-putters will have a higher % of ___ in their arm muscles

Answer 15

fast glycolytic fibers

Question 16

which microscopic structure is found only in the cardiac mm tissue

Answer 16

intercalated discs

Question 17

smooth mm tone is maintained by the prolonged presence of ____ in the mm cells cytosol

Answer 17

acetylcholine

Question 18

what disorder occurs when little to no proteins are produced to support the sarcolemma

Answer 18

muscular dystrophy

Question 19

when an athlete performs a pull up the process of pulling the body up so the chin can touch the bar is

Answer 19

concentric

Question 20

strength training would result in

Answer 20

hypertrophy of fast oxidative- glycolytic fibers

Question 21

mitochondrial activity in skeletal mm cells are usually efficient but can have limited ATP production if

Answer 21

there is limited O2 availability

Question 22

after prolonged strenuous exercise has stopped, heavy breathing will often continue for several minutes in order to provide the O2 needed to

Answer 22

replace O2 displaced from mm myoglobin

convert the lactic acid produced during exercise back into glycogen

resynthesize creatine phosphate

Question 23

cross bridges are formed during mm contraction when ____ binds to ____

Answer 23

myosin binds to actin

Question 24

what happens if you treat the patient w a drug that inhibits the activity of acetylcholinesterase

Answer 24

the drug will increase contraction

Question 25

writers cramp - what factor would most likely contribute to the MMS not being able to relax

Answer 25

a deficit of ATP keeping myosin from detaching

Question 26

in a neuromuscular junction, the effect of ACh binding to receptors on the motor end plate lasts only briefly due to

Answer 26

rapid destruction of ACh in the synaptic cleft by ACh

Question 27

mm damage can be indicated by

Answer 27

myoglobin found in the blood

Question 28

why will an individual who lifts weights build larger muscles

Answer 28

skeletal mm increase number of myofibrils but not number of cells

Question 29

slow oxidative

Answer 29

resists fatigue

Question 30

fast oxidative glycolytic

Answer 30

uses aerobic and anaerobic

Question 31

fast glycolytic

Answer 31

lowest myoglobin content

Question 32

fascia

Answer 32

wraps around groups of mms

Question 33

epimysium

Answer 33

encircles mms

Question 34

perimysium

Answer 34

encircles fasciles

Question 35

endomysium

Answer 35

separates mm fibers