Unformatted text preview: 37) Which of the following is th€ @@equence that occurs during the oxcitation and. contraetion of a muscle cell? 1. Tropomyosin shifts and unblocks the cross-bridge binding sites. Z Calcium is released and binds to the troponin complex. 3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratdreted across the thick filaments by the heads of the myosin molecules using energy 5' An action potential in a motor neulon calrsres the axon to release acetylcholine, which depolarizes the muscle cellmembrane. + ( tr A)5,g,7,2,4 @5,3,2,7,4 c)2,1,g,5,4 D)7,2,3,4,,5 E)2,g,4,.J,,5 38) In which extanJ dass did iaws occur earliest? A) Dipnroi l'+ lil; @chonarichthyes----'fu,* 39) Melatonin has been found to participate in all of the followtng exrept C) Actinopterygii bt'-W @cakiumdepositioninbone. q ? rlt:,$-D)monitoringdaylengttr- V A) reproduction \-/ C) biological rhythms. V B) tronly C) Itronly c-5...
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- Spring '08
- vegetal pole, vegetal pole cells