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31 Cards in this Set

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SKELETAL MUSCLE
basic structure
STRIATED with threads of protein
LONG cylindrical cells with MULTI NUCLEI
SKELETAL MUSCLE
basic workings
-Stimulated by nervous system
-Voluntary control
-attaches to bone and produces movement at joints
SKELETAL MUSCLE
total weight is
40% of total weight. It is the largest amt of muscle in the body
SKELETAL MUSCLE
how do they work?
act in groups to execute body movement
Name 3 functions of the MUSCULAR SYSTEM
1-MOVEMENT
2-TONE, POSTURE
3-GENERATES HEAT
What is SKELETAL MUSCLE made of? 4 parts
1-SKELETAL MUSCLE
2-CONNECTIVE TISSUE
3-NERVOUS TISSUE
4-BLOOD
FASCIA
Dense connective tissue that extends beyond the ends of the muscle and into the tendon that fuses witht the PERIOSTEUM
APONEUROSIS
Another type of connective tissue. It is a broad band that attaches muscle to another muscle
EPIMYSIUM
outerlayer of connective tissue around muscle
PERIMYSIUM
layer around each bundle of fibers (fascicle)
ENDOMYSIUM
layer around each MS cell (fiber)
MUSCLE
BUNDLE OF FASCICLES
FASCICLE
BUNDLE OF FIBERS
FIBERS
BUNDLE OF MYOFIBRILS
-FIBERS ARE THE CELL OF THE MUSCLE
MYOFIBRILS
BUNDLE OF FILAMENTS
-WORKINGS of the FIBER
FILAMENTS
ACTIN- thin protein filament
MYOSIN-thick protein filament
PART OF THE CONTRACTILE UNIT
SARCOLEMMA
the cell membrane of the fiber
SARCOPLASM
found beneath the sarcolemma and it contains mitochondria, nuclui and fibrils
I BAND
1 of 2 striation bands found on the myofibril
-made up of ACTIN filaments
-filaments attaches to the Z lines
A BAND
1 of 2 striation bands found on the myofibril
-made up of myosin filaments
-filaments overlap with ACTIN filaments
Z LINE
-A protein disc that serves as a point of attachment for ACTIN filaments
-divides I Band in half
-
SKELETAL MUSCLE IMPULSE
What stimulates fibers?
Motor Neurons
SKELETAL MUSCLE IMPULSE
What part of the nervous system?
PNS
SKELETAL MUSCLE IMPULSE
What are the 3 main parts of the nerve cell?
AXON, DENDRITES, BODY
SKELETAL MUSCLE IMPULSE
What part of the nerve speeds conduction?
myelin sheath
AXON
carry the nerve impulse to the skeletal ms
MITOCHONDRIA
found in the distal ends of the nerve.
ER
(same as Endoplasmic Reticulum of other cells) sacroplasmic reticulum, a network of MEMBRANOUS CHANNELS that runs parallel each myofibrils
transverse tubules
another set of MEMBRANOUS CHANNELS that open to the outside of the MS fiber
WHAT DO ER and T TUBULES DO?
ACTIVATE THE MS CONTRACTION MECHANISM WHEN THE FIBER IS STIMULATED
Sarcromere
A section of the myofibril found between the Z lines