chapter 9: muscle anatomy (gross and micro)

Question 1

dense fibrous connective, close, outer layer surrounds entire whole muscle

Answer 1

epimysium
aka: fascia
“epi-“: above/upon

Question 2

collagen, separates muscle fibers (cells) into fascicles

Answer 2

perimysium

“peri-“: around

Question 3

bundle muscle fibers, covered by perimysium.

Answer 3

fascicle

Question 4

areolar connective, surrounds individual fibers

Answer 4

endomysium

“endo-“: internal/within

Question 5

what are three names for a muscle cell?

Answer 5

muscle cell
muscle fiber
myocyte

Question 6

how big are muscle cells?

Answer 6

10-100um

10x bigger average cell

Question 7

cell membrane

Answer 7

sarcolemma

Question 8

cytoplasm

Answer 8

sarcoplasm

Question 9

threadlike, parallel, fundamental in muscle contraction

Answer 9

myofibrils

Question 10

what are myofibrils composed of?

Answer 10

sarcomeres

Question 11

what are sarcomeres?

Answer 11

repeating units of actin and myosin

Question 12

what gives muscle its striations?

Answer 12

arrangement of actin and myosin

Question 13

end boundaries of sarcomere

Answer 13

Z disc

Question 14

I bands are ___ and made of thin ___ filaments.

Answer 14

light
actin

Question 15

A bands are ___ and made of thick ___ filaments.

Answer 15

dark
myosin

Question 16

Specialized smooth endoplasmic reticulum

Answer 16

Sarcoplasmic Reticulum

Question 17

network of channels running parallel to myofibrils, store Ca2+

Answer 17

sarcoplasmic reticulum

Question 18

channels inward from sarcolemma, passes through muscle fiber, across S.R., “telegraph system”

Answer 18

Transverse “T” tubules

Question 19

variation of hemoglobin, stores O2, high affinity (good at grabbing O2)

Answer 19

myoglobin