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BIOL 302 > Muscle > Flashcards

Flashcards in Muscle Deck (20):
1

function

generation of force
-movement
-structural support
-glands
-physio

2

tissue metabolism

contraction is ATP-dependent
highly metabolic --> lots of mitochondria
nutrient supply via blood vessels

3

tissue types

striated (skeletal/cardiac)
smooth

4

myoepithelial

glands

5

myofibroblast

scar tissue

6

pericytes

blood vessels

7

skeletal muscle

voluntary, moves skeleton and organs

8

organization of skeletal muscle

muscle --> surrounded by epimysium
fascicles --> surrounded by perimysium
multinucleate cell = fiber --> surrounded by endomysium
surrounded by fascicles is sarcolemma
sarcoplasm surrounds the area between myofibrils
each muscle fiber divided into bundles of myofibrils and filaments

9

cross section of skeletal muscle

polygonal
speckled
bundles (fascicles)
peripheral neurons

10

longitudinal section of skeletal

long
stritated
peripheral nuclei
unbranched

11

what causes striations in muscle fibers

sarcomeres
Z line = junction (middle of I)
M line = middle (middle of A, H)
A band = actin + myosin (dark band)
H band = myosin (lighter area in middle of A, surrounding M line)
I band = actin (light band)

12

what is the myofibril contractile unit

sarcomere

13

what is a sarcomere made of

myosin + actin

14

how is skeletal muscle contraction regulated?

fiber twitch rate determined by nerve output (each type has own neural output)
"convergence" - one nerve, many muscle fibers
motor end plate = modified synapse

15

cardiac muscle structure

striated
branched
1-2 nuclei/cell
highly vascularized
intercalated disks
many mitochondria

16

intercalated disks

fascia adherens
consist of desmosome and gap junction

17

smooth muscle

NOT striated
central nucleus (speckled)
fusiform fibers
appears smooth
few blood vessels
central elongate nucleus
thicccccc

18

which muscles regenerate

skeletal and smooth

19

what muscle types have sarcomeres

skeletal + cardiac

20

what are the types of specialised muscle cells?

pericytes (blood vessles)
myoepithelial (expends contents of glands
myofibrobalast (scars)