Histology Muscle Tissues

Question 1

Function of muscles

Answer 1

Contract/get smaller, cannot force themselves to get bigger, but can be stretched.

Question 2

Skeletal muscle

Answer 2

Syncytium/multi nucleated. Attached to bone, antagonists that work together

Question 3

Cardiac muscle

Answer 3

individual nucleus in center of cell

Question 4

Smooth muscle

Answer 4

fusiform (tapered at ends)

Question 5

Striated muscles

Answer 5

Skeletal and cardiac, voluntary contraction

Question 6

Non-striated muscles

Answer 6

Involuntary, Smooth muscles

Question 7

Protoplasm eq (cytoplasm, nucleus, organelles)

Answer 7

Sacroplasm

Question 8

Plasmalemma eq (plasma membrane)

Answer 8

Sacrolemma (membrane wrapping each muscle cell)

Question 9

Smooth ER eq

Answer 9

Sarcoplasmic Reticulum

Question 10

Mitochondria eq

Answer 10

Sarcosomes

Question 11

Muscle Cell

Answer 11

Myofiber

Question 12

Sarcomere

Answer 12

Linear subunit

Question 13

Striated muscle layout from epimysium to myofiber

Answer 13

muscle fiber surrounded by endomysium, groups of muscle fibers surrounded by perimysium, group of muscle fibers called fascicle. Epimysium surrounds whole tissue.

Question 14

Striated muscle layout from myofiber to sarcomere

Answer 14

Myofibrils make up a myofiber. Light areas are I band, dark areas are A band. Middle of I band is dark line called Z line where actin filaments meet.

Question 15

T tubules in striated muscle cells

Answer 15

Carry electric signals from the surface into and around myofibrils. Causes release of calcium from the SR triggering contractions

Question 16

Cardiac muscle components

Answer 16

Everything skeletal muscle has + intercalated discs (desmosomes, gap and tight junctions), individual cells with central nucleus, branched

Question 17

Smooth muscle characteristics

Answer 17

Single central nucleus, interconnected by gap junctions, fusiform cells, External lamina on outer surface (like basal lamina)

Question 18

Contraction of smooth muscle

Answer 18

Myosin is at junctions, elongated nucleus forms corkscrew

Question 19

smooth muscle layers

Answer 19

Circular layer (muscle in long section) and longitudinal layer (muscle in cross section)