Skeletal Muscle Structure

Question 1

Types of muscle

Answer 1

smooth
cardiac
skeletal

Question 2

Smooth muscle

Answer 2

Smooth involuntary: not striated, single nuclei, digestive, respiratory, and vascular tissues, extremely elastic and pliable

Question 3

Cardiac Muscle

Answer 3

Striated involuntary: cardiac muscle, branched structure, intercalated discs, 1-2 nuclei/cell

Question 4

Skeletal Muscle

Answer 4

voluntary striated: skeletal muscle, multi-nucleated, most abundant form

Question 5

Muscle tasks

Answer 5

primer movers
antagonists
fixation
syngerists
muscles have specific tasks

Question 6

Prime movers

Answer 6

accomplish specific movement
must relax for prime mover to perform

Question 7

fixation movers

Answer 7

hold the base for prime movers

Question 8

synergists

Answer 8

stabilize in opposition to gravity
(keeps us standing)

Question 9

Connective tissue

Answer 9

collagen
elastin
reticular fibers

Question 10

Collagen

Answer 10

most abundant protein
water soluble
inelastic

Question 11

Elastin

Answer 11

very elastic
not water soluble
blood vessels, tendons, and ligaments

Question 12

reticular fibers

Answer 12

small and delicate
surround many organs

Question 13

epimysium

Answer 13

silver skin
around muscle body
anchors to tendon
protection

Question 14

perimysium

Answer 14

around muscle bundles
pathway for nerves and blood flow
marbling

Question 15

endomysium

Answer 15

around muscle fibers
tenderness

Question 16

Arrangement of muscle fibers

Answer 16

origins to insertion
angular
fulsiform
pinnate (uni, bi, multi)

Question 17

Origins to insertion

Answer 17

small muscles (intercostae)

Question 18

Angular

Answer 18

Angular to longitudinal section of the muscle (longissimus dorsi)

Question 19

Fulsiform

Answer 19

fibers run parallel to the muscle (biceps brachi)

Question 20

pinnate

Answer 20

originate from connective sheaths in leaf array (deltoid)

Question 21

levels of muscle structure

Answer 21

muscle
muscle bundle
muscle fiber (myofiber)
myofribrils
myofilaments

Question 22

Muscle bundles

Answer 22

contains 10-20 myofibers
encased by perimysium
can see with the naked eye

Question 23

myofiber

Answer 23

individual muscle cell
multinucleated
encased by endomysium
cell wall: sarcolemma

Question 24

Myofibrils

Answer 24

embedded in sarcoplasm
mitochondria located between myofibrils
compromised of repeating units

Question 25

sarcomeres

Answer 25

A band
I band
Z disk
H zone
Pseudo H zone