Muscular System

Front 1

SKELETAL MUSCLE
basic structure

Back 1

STRIATED with threads of protein
LONG cylindrical cells with MULTI NUCLEI

Front 2

SKELETAL MUSCLE
basic workings

Back 2

-Stimulated by nervous system
-Voluntary control
-attaches to bone and produces movement at joints

Front 3

SKELETAL MUSCLE
total weight is

Back 3

40% of total weight. It is the largest amt of muscle in the body

Front 4

SKELETAL MUSCLE
how do they work?

Back 4

act in groups to execute body movement

Front 5

Name 3 functions of the MUSCULAR SYSTEM

Back 5

1-MOVEMENT
2-TONE, POSTURE
3-GENERATES HEAT

Front 6

What is SKELETAL MUSCLE made of? 4 parts

Back 6

1-SKELETAL MUSCLE
2-CONNECTIVE TISSUE
3-NERVOUS TISSUE
4-BLOOD

Front 7

FASCIA

Back 7

Dense connective tissue that extends beyond the ends of the muscle and into the tendon that fuses witht the PERIOSTEUM

Front 8

APONEUROSIS

Back 8

Another type of connective tissue. It is a broad band that attaches muscle to another muscle

Front 9

EPIMYSIUM

Back 9

outerlayer of connective tissue around muscle

Front 10

PERIMYSIUM

Back 10

layer around each bundle of fibers (fascicle)

Front 11

ENDOMYSIUM

Back 11

layer around each MS cell (fiber)

Front 12

MUSCLE

Back 12

BUNDLE OF FASCICLES

Front 13

FASCICLE

Back 13

BUNDLE OF FIBERS

Front 14

FIBERS

Back 14

BUNDLE OF MYOFIBRILS
-FIBERS ARE THE CELL OF THE MUSCLE

Front 15

MYOFIBRILS

Back 15

BUNDLE OF FILAMENTS
-WORKINGS of the FIBER

Front 16

FILAMENTS

Back 16

ACTIN- thin protein filament
MYOSIN-thick protein filament
PART OF THE CONTRACTILE UNIT

Front 17

SARCOLEMMA

Back 17

the cell membrane of the fiber

Front 18

SARCOPLASM

Back 18

found beneath the sarcolemma and it contains mitochondria, nuclui and fibrils

Front 19

I BAND

Back 19

1 of 2 striation bands found on the myofibril
-made up of ACTIN filaments
-filaments attaches to the Z lines

Front 20

A BAND

Back 20

1 of 2 striation bands found on the myofibril
-made up of myosin filaments
-filaments overlap with ACTIN filaments

Front 21

Z LINE

Back 21

-A protein disc that serves as a point of attachment for ACTIN filaments
-divides I Band in half
-

Front 22

SKELETAL MUSCLE IMPULSE
What stimulates fibers?

Back 22

Motor Neurons

Front 23

SKELETAL MUSCLE IMPULSE
What part of the nervous system?

Back 23

PNS

Front 24

SKELETAL MUSCLE IMPULSE
What are the 3 main parts of the nerve cell?

Back 24

AXON, DENDRITES, BODY

Front 25

SKELETAL MUSCLE IMPULSE
What part of the nerve speeds conduction?

Back 25

myelin sheath

Front 26

AXON

Back 26

carry the nerve impulse to the skeletal ms

Front 27

MITOCHONDRIA

Back 27

found in the distal ends of the nerve.

Front 28

ER

Back 28

(same as Endoplasmic Reticulum of other cells) sacroplasmic reticulum, a network of MEMBRANOUS CHANNELS that runs parallel each myofibrils

Front 29

transverse tubules

Back 29

another set of MEMBRANOUS CHANNELS that open to the outside of the MS fiber

Front 30

WHAT DO ER and T TUBULES DO?

Back 30

ACTIVATE THE MS CONTRACTION MECHANISM WHEN THE FIBER IS STIMULATED

Front 31

Sarcromere

Back 31

A section of the myofibril found between the Z lines