Chapter Ten- Contraction TEST 3
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semedo08 Plus on September 22, 2011
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5 terms
Terms | Definitions |
|---|---|
 STEP ONE | A NERVE IMPULSE arrives at the AXON terminal of the MOTOR NEURON , and releases (ACH), filling SYNAPTIC VESSLES with ACH, which DIFFUSES across SYNAPTIC CLEFT BINDS to its RECEPTORS (MOTOR END PLATE, releasing NA+ which triggers a muscle action potential (MAP). |
| STEP TWO | The MAP travels along T-Tubule OPENING Calcium release CHANNELS in the sarcoplasmic reticulum membrane (SRM), which allows CA-2 IONs to FLOOD into the SARCOPLASM. |
| STEP THREE | Acetylcholinesterase (ACH E) in synaptic cleft DESTROYS EXCESS (ACH), CA-2 BINDS to TROPONIN on ACTIN (thin filaments), EXPOSING the BINDING SITES for MYOSIUM (Calcium levels increase). |
| STEP FOUR | Contraction: power strokes use ATP; myosin head binds to actin, thin filaments are pulled toward the center of the sarcomere. (ATTACH, PIVOT, DETACH, RELEASE) |
| STEP FIVE | (Calcium active transport pumps) Calcium RELEASE CHANNELS in SR CLOSE and Calcium active transport pumps use ATP to lower calcium ions levels in sarco-plasm causing the TROPONIN-MYOSIUM COMPLEX to SLIDE BACK into position where it BLOCKS the MYOSIUM ACTIVE SITES ON ACTIN causing muscles to relax |
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