Structure of Skeletal Muscles

Question 1

skeletal muscle

Answer 1

organ; composed of skeletal muscle tissue, nervous tissue, blood and connective tissue

Question 2

fascia

Answer 2

covers/separates a skeletal muscle from adjacent muscles; also helps to hold it in place

Question 3

tendon

Answer 3

cord-like structure that attaches to the bone (periosteum), or forms a broad sheet

Question 4

aponeurosis

Answer 4

attach to adjacent muscle coverings or to bone

Question 5

epimysium

Answer 5

muscle is covered in a layer of connective tissue

Question 6

perimysium

Answer 6

connective tissue that separates muscle tissue into small sections

Question 7

fascicle or fasciculus

Answer 7

bundles of muscle fibers

Question 8

endomysium

Answer 8

each fiber in the fascicle is covered with connective tissue

Question 9

stretching

Answer 9

connective tissue stretch better when slow, gentle force is applied at elevated tissue temperatures

Question 10

single cell

Answer 10

series of fused muscle cells

Question 11

contracts

Answer 11

response to stimulation

Question 12

skeletal muscle fibers

Answer 12

thin, elongated cylinder with rounded ends, and may extend full length of muscle

Question 13

sarcolemma

Answer 13

cell membrane surrounding each muscle fiber

Question 14

sarcoplasm

Answer 14

included everything within a cell, except nucleus and cell membrane

Question 15

myofibrils

Answer 15

• lie parallel to one another, threadlike
• fundamental role in muscle contraction
• contain 2 protein filaments (myosin and actin)

Question 16

myosin

Answer 16

thick

Question 17

actin

Answer 17

thin

Question 18

troponin and tropomyosin

Answer 18

regulatory protein filaments

Question 19

troponin-tropomyosin complex

Answer 19

formed from troponin and tropomyosin

Question 20

I bands

Answer 20

• composed of thin actin filaments
• attached to Z lines
• light striations

Question 21

Z lines

Answer 21

the point at which actin filaments from adjacent sarcomeres interweave to create lines

Question 22

A bands

Answer 22

• composed of thick myosin filaments
• overlap with thin actin filaments
• dark striations

Question 23

H zone

Answer 23

• thick filaments; no thin

- M line

Question 24

M line

Answer 24

thickening

Question 25

sarcomere

Answer 25

segment that extends from Z line to the next Z line

Question 26

striated muscle

Answer 26

repeating A and I bands account for the band pattern in the myofibrils