Quiz 5 - Skeletal Muscle Structure

Question 1

Connective tissue

Answer 1

• epimysium
• perimysium
• endomysium

Question 2

epimysium

Answer 2

surrounds entire muscle

Question 3

perimysium

Answer 3

surrounds group of muscle fibers

- fascicles = bundles of muscle fibers

Question 4

endomysium

Answer 4

surrounds individual muscle fibers

Question 5

muscle fiber

Answer 5

• sarcolemma
• sarcoplasmic reticulum (SR)
• T-tubules
• myofibrils

Question 6

sarcolemma

Answer 6

plasma membrane surrounding each muscle fiber

Question 7

sarcoplasmic reticulum (SR)

Answer 7

membranous sacs surrounding each myofibril, containing calcium (calcium starts the contraction - the gas for muscles)

Question 8

T-tubules

Answer 8

transverse tubules: transmit electrical activity through cell, allow coordinated muscle contraction

Question 9

myofibrils

Answer 9

individual cylinder bundle compose of thin and thick filaments, structures responsible for muscle fiber contraction

Question 10

thick filaments

Answer 10

myosin - contractile bundles of myosin molecules

Question 11

thin filament

Answer 11

actin - 2 strands of actin chains wrapped around each other