Muscle Tissue

Front 1

MUSCLE FUNCTION

Back 1

MOVEMENT OF BONES OR FLUID(BLOOD)

MAINTAIN POSTURE AND BODY POSITION

STABILIZE JOINTS

HEAT GENERATION (ESPECIALLY SKELETAL MUSCLE)

Front 2

skeletal muscle EPIMYSIUM

Back 2

DENSE REGULAR CONNECTIVE TISSUESURROUNDING THE ENTIRE MUSCLE

Front 3

skeletal muscle PERIMYSIUM

Back 3

FIBROUS CONNECTIVE TISSUE SURROUNDING FASCICLES (GROUPS OF FIBERS)

Front 4

skeletal muscle ENDOMYSIUM

Back 4

FINE AREOLAR CONNECTIVE TISSUE SURROUNDING EACH MUSCLE FIBER

Front 5

A MUSCLE CELL IS CALLED A

Back 5

MUSCLE FIBER.

Front 6

MUSCLE CELLS/FIBERS ALL HAVE

Back 6

NUCLEUS,ORGANELLES AND A PLASMA MEMBRANE

Front 7

PLASMA MEMBRANE SURROUNDING A MUSCLEFIBER IS

Back 7

SARCOLEMMA

Front 8

SARCOLEMMA HAS A CONNECTIVE TISSUE COVERING OF AREOLAR CONNECTIVE TISSUE CALLED THE

Back 8

ENDOMYSIUM

Front 9

when epimysium continues to thicken it becomes

Back 9

dense regular connective tissue theat becomes the tendon. the tendon attaches the entire muscle to a bone.

Front 10

glycosomes are unique to the muscle cell

because

Back 10

this is where the glycogen is stored

Front 11

purpose of mirochondria

Back 11

they produce atp

Front 12

Glycosomes

Back 12

For glycogen storage,myoglobin or on storage. Contains myofibrils, sacroplasmic reticulum and t-tubules

Front 13

myofibrils

Back 13

densely packed rod like elements

80% of cell vol.

exhibit striations: perfectly aligned repeating series of dark 'A' and light 'I' bands

multiple mitochondria as well as glycosomes and myoglobin.

Front 14

sarcomere

Back 14

smallest functional contractile unit of muscle fiber. between two Z discs. composed of thick and thin myofilaments mad of contractile proteins. thick filaments run length of 'A' band. thin filaments run length of 'I' band and part of the way to 'A' band. Z discs are a coin shaped sheet of proteins that anchor thin filaments and connect myofibrils to one another.

H zone: lighter midregion where filaments do not overlap.

M line: line of proteins tyomesin that holds adjacent thick filaments together.

Front 15

ultrastructure of thick filaments

Back 15

myosin tail' contains 2 interwoven, heavy polypeptide chains

myosin head: 2 smaller polypeptide chains that act as a cross bridge during contraction.

: binding site for actin of thin filaments

: binding site for ATP

ATPese enzyme

Front 16

ultrastructure of thin filaments

Back 16

twisted double strand of actin. actin contains the active site for myosin head attachment during contraction.

tropomyosin and troponin: regulatory proteins bound to actin.

Front 17

sarcoplasmic reticulum

Back 17

network of smooth ER (endoplasmic reticulum) surrounding each myofibril. pairs of terminal cisternae from cross channels. function in regulation of intracellular ca2

Front 18

T-tubles

Back 18

continuous with sarcolemma. penetrate the interior of the cell at each A band and I band junction. associate with the paired terminal cisternae to form a triad encircling each sarcomere.

Front 19

sliding filament model of contraction

Back 19

in relaxed state thin and thick filaments slightly overlap.

During contraction, myosin heads bind to actin, Detach and bind again to propel thin filaments twords the M line as the H zone shortens and disappears. the entire muscle shortens.

one of the most basic levels of how the muscle cell contracts and shortens. In order for muscle to contract the sarcomers has to get thinner and thinner.

Front 20

requirements for skeletal muscle contraction

Back 20

activation. neural stimulation at a neuromuscular junction. this is where the terminus of a nerve interacts with a muscle fiber.