Muscle Tissue

Question 1

Muscle tissue types

Answer 1

1. ) skeletal
2. ) cardiac
3. ) smooth

Question 2

Muscle cell

Answer 2

fiber or myocyte

Question 3

cytoplasm in muscle cell

Answer 3

sarcoplasm

Question 4

sER in muscle cell

Answer 4

sarcoplasmic reticulum

Question 5

Sarcomere

Answer 5

repeating (intracellular) functional unit of striated muscle, subunit of myofibril, composed of myofilaments (thin-actin, thick-myosin, z-disc)

Question 6

myofibril

Answer 6

a tubule composed of sarcomeres in a series :striated or striped, sarcomeres lined up end to end, myofilaments line up to produce striation visible to light microscopy ( A band-over myosin, I Band-over Z line, Z line-where actin meets)

Question 7

myofilaments

Answer 7

protein filaments (actin and myosin primarily) arranged in sarcomere

Question 8

Gen. muscle tissue characteristics

Answer 8

cellular, vascular, specialized to contract

Question 9

skeletal muscle characteristics

Answer 9

Adapted for speed 1.)moves skeleton and maintains posture 2.) produces body heat

40-50% of mass, 639 muscles, 10-100 microns in diameter, 1-4 centimeters long, multinucleated to the side, filled with myofibrils, cross striation due to sarcomeres

Question 10

Sliding Filament Theory

Answer 10

filaments slide to produce shortening

Question 11

CT framework or layers for skeletal muscle

Answer 11

1. )endomysium-loose CT incases each fiber
2. ) Perimysium- loose CT encase bundle of fibers (fascicle)
3. ) Epimysium- Dense CT encases entire belly, component of deep fascia

Question 12

Cardiac Muscle

Answer 12

involuntary, makes up wall of heart, specialized to contract rhythmically, striated, sarcomeres and myofibrils, 15micron diameter 100microns long, single central nucleus, branching anastomosing, intercalated discs=fascia adherens, no voluntary motor nerves

Question 13

Intercalated Discs

Answer 13

Found in cardiac muscle, junctions known as zonula adherens and macula (fascia) allows for structural linkage at myocytes

gap junctions allow electrical signal to pass from one myocyte to the next (b/c no voluntary nerves)

Question 14

Smooth Muscle

Answer 14

Found in the walls of viscera and blood vessels, can contract tonically to maintain dimension, can contract physically to push contents along visceral tube, slow acting, involuntary, spindle shape, single central nucleus, no cross striation, thick and thin filaments arrange obliquely across the cell, no sarcomeres, smallest muscle cell, regulated by local tissue factors (o2,co2) and autonomic nervous system