Skeletal Muscle Anatomy

Question 1

myology

Answer 1

study of the muscles

Question 2

3 types of muscle tissue

Answer 2

cardiac, smooth and skeletal

Question 3

cardiac muscle location and function

Answer 3

in the heart
has striations
involuntary
pumps blood
able to regenerate sometimes

Question 4

smooth muscle

Answer 4

no striations
involuntary
locations: inside hollow organs, lungs, blood vessels, and stomach
function: depends on what organ it is in.

Question 5

general characteristics

Answer 5

40 to 50 percent of total body weight

Question 6

5 functions

Answer 6

1) produce heat by contractions
2) produces movement
3) regulates organ volume
4) stabilizes body positions
5) moves substances through to body

Question 7

skeletal muscle tissue

Answer 7

connective tissue
each skeletal muscle is an organ composed of hundreds to thousands of muscle fibers
vascular with nerve supply
require large amounts of ATP
Connective tissue surrounds the muscle fiber and the entire muscle

Question 8

fascia

Answer 8

sheet of CT found beneath the skin and around muscles and organs
Superficial- right under the skin (areolar and adipose CT)
Deep- holds muscles together, separates into functional groups (bundles) (dense irregular connective tissue)

Question 9

epimysium

Answer 9

covers entire muscle cell

Question 10

perimysium

Answer 10

surrounds bundles of 10 to 100 muscle fibers called fascicles

Question 11

endomysium

Answer 11

wraps around each indiuval muscle fiber

Question 12

tendon

Answer 12

bone to bone
collagen fibers, cord of dense regular connective tissue

Question 13

muscle histology

Answer 13

muscle fibers- 100 to 1000 making up skeletal muscles
- arranged parallel to each other

Question 14

sarcolemma

Answer 14

plasma membrane around each muscle fiber

Question 15

transverse (t) tubules

Answer 15

tunnel-like extensions of sarcolemma that pass through muscle fibers from side to side

Question 16

sarcoplasm

Answer 16

muscle fibers cytoplasm
-many mitochondria for ATP during muscle contractions

Question 17

sarcoplasmic reticulum

Answer 17

network of fluid-filled membrane enclosed tubules
-store Ca ions for contractions, similar to smooth ER

Question 18

myoglobin

Answer 18

red pigment in sarcoplasm
-gives color to skeletal muscle
-stores O2

Question 19

myofibrils

Answer 19

cylinder structure found inside muscle fibers

Question 20

filament

Answer 20

overlap in specific patterns to form sarcomeres

Question 21

sarcomere

Answer 21

basic functional unit of striated muscle fibers

Question 22

Z Disc

Answer 22

zig zagging zones on dense proteins- separated sarcomere from each other

Question 23

A Band

Answer 23

dark area in sarcomere

Question 24

H Zone

Answer 24

narrow part of thick filament

Question 25

I Band

Answer 25

light area on each side of A Band

Question 26

thick filaments

Answer 26

made from the protein myosin
-looks like 2 golf clubs twisted together (myosin heads and myosin tails)