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11 Cards in this Set
- Front
- Back
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Descriptiveterms for muscle actions
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Adductor Pronator Abductor
Tensor Levator Depressor |
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Effectof acetylcholine bonding to a receptor at the motor end plate
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Theend plate membrane becomes more permeable to sodium ions
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Effectof an elevated thyroid hormone level
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Stimulateenergy use and heat production
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Effectof calcium binding to troponin
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Tropomyosinmoves into the groove between the helical actin strands
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Effectof decreased blood flow to muscles
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1. Muscle fatigue
2. An oxygen debt 3. A shift to anaerobic glycolysis 4. An increase in intracellular lactate |
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Effectof the loss of acetylcholinesterase
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Cause spastic paralysis (muscles are contracted and unable to relax)
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Endomysium
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Delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together.
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Epimysium
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Denselayer of connective tissue that surrounds an entire skeletal muscle
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Events inMuscle Contraction
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1. Calcium ion is released from the sarcoplasmic reticulum
2. Calcium ion binds to troponin 3. Myosin cross-bridges bind to the actin 4. Myosin head pivots toward the center of the sarcomere. 5. Myosin head binds an ATP molecule and detaches from actin 6. The free myosin head splits the ATP |
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Excitation-ContractionCoupling
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1. Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum
2. Tropomyosin moves to expose myosin binding sites on the actin 3. Calcium released from the sarcoplasmic Reticulum 4. Troponin binds calcium ion and signals tropomyosin to move |
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Exocytosis
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Mechanism where synaptic vesicles release neurotransmitters when the action potential arrives
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