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A&P test 4- 10,11,12

Chapters 10,11& 12

QuestionAnswer
Epimysium layer on top of the muscle, covers the entire muscle
Perimysium covers a muscle fascicle
Endomysium surrounds one muscle fibers
Somatic Motor Neurons Neurons that can innervate skeletal muscle
Fascia band or sheet of dense irregular connective tissue, surrounds muscles and other organs
Sarcolmemma plasma membrane of muscle fiber
t tubules extensions into the muscle fiber
sarcoplasm cytoplasm of the muscular fiber
myofibrils thread like contractile, contain several sacromeres laid end to end
Sacromeres functional unit of the skeletal muscle, contains contractile, regulatory and structural proteins
Contractile Proteins Actin and myosin
Regulatory Proteins troponin and tropomyosin
Structural proteins titin- stabilizes myosin, dystrophin- links think filaments to sarcolemma
A band middle part of the sarcomere that extends the entire length, includes the parts of the thin filaments that overlap with thick filaments
Z discs narrow regions of dense material that separate one sarcomere from the next
I band lighter less dense area, contains the rest of the thin filaments but no thick filaments
H zone narrow region in the center of each A band, it contains thick filaments but no thin filaments
M line region of the center of the H zone, contains proteins that hold the thick filaments together the center of the sarcomere
Synaptic Cleft gap between neuron and muscle fiber
Motor Plate region of sarcolemma containing receptors for neurotransmitter
3 sources of ATP Creatine phosphate pathway, anaerobic cellular respiration and aerobic respiration
When is ATP needed? to power the contraction cycle and pump calcium back into the SR
3 basic functions of the nervous system senstaion, intergration, motor output
Created by: jlmoses
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