Histology - muscular tissue

Question 1

skeletal muscle is

Answer 1

striated and voluntary

Question 2

cardiac muscle is

Answer 2

striated and involuntary

Question 3

smooth muscle is

Answer 3

non-striated and involuntary

Question 4

skeletal muscles attach to

Answer 4

skeleton

Question 5

skeletal fibers appear

Answer 5

long, ribbon like, non branching and parallel

Question 6

skeletal muscle cell membrane is called the

Answer 6

sarcolemma

Question 7

skeletal muscle nuclei are

Answer 7

multiple, elongated, and peripheral

Question 8

skeletal muscle cytoplasm is called ___ and is acidophili and transversely strated due to presence of great number of crossly banded cellular fibrils called ____

Answer 8

sarcoplasm; myofibrils

Question 9

skeletal muscle main cytoplasmic inclusions is

Answer 9

gycogen

Question 10

myofibrils have dark and light zones that make it

Answer 10

striated

Question 11

skeletal muscles need a lot of

Answer 11

mitochondria

Question 12

function of skeletal muscles

Answer 12

movement and heat production

Question 13

each fiber of skeletal muscle is surrounded by a thin, loose CT called

Answer 13

endomysium

Question 14

fibers bundle together and bundles are separated by

Answer 14

perimysium

Question 15

the whole muscle covered by

Answer 15

epimysium

Question 16

course thick bands are

Answer 16

myosin

Question 17

fine thing bands

Answer 17

actin

Question 18

sarcomere are

Answer 18

the contractile unit of the muscle fiber

Question 19

sarcomere is the area of a myofibril

Answer 19

lying between two successive Z discs

Question 20

A band

Answer 20

length of myosin that also overlaps the actin

Question 21

I band

Answer 21

length of just myosin

Question 22

Z discs

Answer 22

vertical thick bands that move together during contraction

Question 23

z band to z band is the

Answer 23

sarcomere

Question 24

troponin

Answer 24

make tropomyosin stay in place

Question 25

when troponin isnt there, tropomyosin leaves and

Answer 25

actin binds to myosin head and contraction begins

Question 26

tropomyosin

Answer 26

blocks active site on actin

Question 27

when calcium is present troponin will stop its job to bind with calcium opening active sites on actin and

Answer 27

tropomyosin will move

Question 28

actin

Answer 28

globular protein that forms two fibrous strands that twist around each other to form bulk of thin filament

Question 29

myosin

Answer 29

most of thick filament

Question 30

myosin heads are chemically attracted to

Answer 30

actin molecules

Question 31

myosin heads are known as cross bridges when attached to

Answer 31

actin

Question 32

network of smooth endoplasmic reticulum known as

Answer 32

sarcoplasmic reticulum

Question 33

tubules derived from sarcolemma in the form of invaginations into the sarcoplasm around myofibrils known as

Answer 33

transverse tubules

Question 34

T-tubules help to

Answer 34

carry the action potential from muscle surface to the myofibrils inside

Question 35

cardiac muscle is

Answer 35

branching

Question 36

cardiac muscles have fibers cut into longiudinal section appear divided into short columnar units by dark lines called

Answer 36

intercalated discs

Question 37

cardiac nuclei are

Answer 37

central, oval and single

Question 38

smooth muscles found

Answer 38

walls of digestive tract, urinary tract, blood vessels, lymphatic vessels, and male and female genital tracts

Question 39

smooth muscle fibers appear

Answer 39

long spindle-shaped with single elongated central nuclei