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