Muscle Histology

Question 1

What makes up thin tissue?

Answer 1

actin

Question 2

What makes up thick tissue?

Answer 2

myosin

Question 3

Where are the nuclei located in the muscle cells?

Answer 3

Peripherally

Question 4

Endomysium

Answer 4

surrounds individual muscle fibers with small blood vessels. Surround perimysium

Question 5

perimysium

Answer 5

thicker, form fasicle with larger blood vesselse

Question 6

epimysium

Answer 6

dense, surrounds fasciles with major blood vessels

Question 7

What are muscle fibers classified as? (What 3 types)

Answer 7

Red, white, intermediate

Question 8

A band

Answer 8

ansiotropic, dark, stays same in contraction. Encompass all thick filament (myosin)

Question 9

I band

Answer 9

istropic, light, shortens in contraction, encompass all actin

Question 10

H band

Answer 10

bright, middle of A bind, shorten in contraction, made of myosin

Question 11

M line

Answer 11

middle of sarcomere, made of myosin

Question 12

Z disc

Answer 12

between and middle of I band, shorten in contraction, in between I band, doesn’t contain myosin

Question 13

What does troponin do?

Answer 13

facilitate/inhibit contraction through detection of Ca

Question 14

Calcium regulate contraction

Answer 14

Stimulate AP

Question 15

Sarcoplasmic reticulum

Answer 15

from A-I junction

Question 16

Terminal Cisterna

Answer 16

resevoirs of Ca, has cell membrane

Question 17

Transverse tubular system

Answer 17

invaginations of sarcolemma at A-I band, have T-Tubules with electrical currents

Question 18

Triad

Answer 18

one T tubule, 2 adjacent terminal cisternae only works on skeletal muscle

Question 20

Skeletal Ca blocker
Leads to what?
What structure produces Ca

Answer 20

leads to paralysis, sarcoplasmic reticulum produces Ca

Question 21

Presynaptic Vesicle Contents

Answer 21

acetylcholine

Question 22

Innervation

Answer 22

need to maintain structural integrity, each neuron/motor unit brings contraction

Question 23

muscle spindles

Answer 23

encapsulate sensory receptors, with stretch receptor, degree muscle tension

Question 24

spindle cells

Answer 24

modified muscle fibers
Morphological appearance of elongated cells

Question 25

sensory nerve fib ers

Answer 25

back to CNS

Question 26

motor nerve gamma fibers

Answer 26

sensitivity of muscle spindle

Question 27

Muscular Dystrophy

Answer 27

destroy own muscles

Question 28

Duchenne Muscular dystrophy

Answer 28

Xlink recessive, most common muscular dystrophy