LECTURE 1 muscle tissue Flashcards Preview

anatomy lecture exam 1 > LECTURE 1 muscle tissue > Flashcards

Flashcards in LECTURE 1 muscle tissue Deck (17):
1

functions of muscle tissue (4)

movement (main function), maintenance of posture, joint stabilization, generates heat (thermoregulation)

2

muscle cells

elongated (called fibers), contain many myofilaments (actin and myosin)

3

types of muscle tissue (3)

skeletal, cardiac, smooth

4

special features of muscle (4)

contractibility, excitibility, extensibility, elasticity

5

contractibility

cells generate pulling force

6

excitibility

nervous impulses travel through muscle plasma membrane to stimulate action

7

extensibility

after contraction, muscle can be stretched back to original length by opposing muscle action

8

elasticity

after being stretched, muscle passively recoils to resume its resting length

9

skeletal muscle qualities

voluntary function with a few exceptions; attached to bones, fascia, skin; have origin and insertion

10

cells of skeletal muscle

long and cylindrical in bundles, multinucleate, obvious striations

11

CT components of skeletal muscle

enomysium (surrounds fibers), perimysium (surrounds bundles), epimysium (surrounds the entire muscle)

12

cardiac muscle qualities

involuntary function, forms myocardium layer of heart wall that pumps blood through vessels, lots of mitrochondria for energy so muscle can't fatigue

13

cells of cardiac muscle

branching chains of cells, single or binucleate, striations, connected by intercalated discs (tight cell junctions, same direction as striations)

14

CT component of cardiac muscle

endomysium (surrounding cells)

15

smooth muscle qualities

involuntary function (2 layers in opposite directions that perform peristalsis, churning, segmentation, dilation/constriction), found in hollow organs

16

cells of smooth muscle

single cells, uninucleate, no striations, cells stacked on each other forming sheets

17

CT component of smooth muscle

endomysium (surrounding cells)