Neurons supplying smooth muscle secrete histamine display receptors only on the dendrites create precise neuromuscular junctions with each myocyte display swellings called varicosities
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- Nerve impulses first stimulate a skeletal muscle fiber at _______. a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sitesAfter death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.27. Which of the following seutences is NOI curreet? I Myotibroblast is a connective tissse cell that contuns propemes of sanooth muscle celle III Ounonin is the eall mevement of salts fomaegian af higher cancentration to a repion of lauer couccutrutsen darongh a pertially permcalble ueubnae IV. chrcuos uf circalating RBCa nE cuained in the sucleus v. Catctiol (acuve form of vataman D) elevates blood Ca" by actung ca atestne, kadaeys and stiulate osteoblant setivity
- The disease poliomyelitis (po′le-o-mi′˘e-li′tis) destroys motor neurons, causingloss of muscle function and even flaccid paralysis. Some patients recoverbecause axon branches form from the remaining motor neurons. Thesebranches innervate the paralyzed muscle fibers to produce motor unitswith many more muscle fibers than usual. How does this reinnervation ofmuscle fibers affect the degree of muscle control in a person who hasrecovered from poliomyelitis?In the absence of _____, a contracted skeletal muscle will not relax but will develop rigor mortis calcium magnesium adenosine diphosphate adenosine triphosphate glucoseMuscles relaxatiom occurs when acetylcholine is cleaved from its receptors ,calcium is pulled back into the sarcoplasmic recticulum,the myosin is released from its binding site ,and the muscle fiber returns to its resting lenght true or false
- 5. Identify the structures in this diagram of a muscle fiber Describe the function of each structure. 8) 4 9) Modifed by C Seiwert from original by Shaleta madepn Original uploadr was.ermyempat enwkipediaruti werk Abduramanii2 tulk) - Skeital muscda.ont. Pubfic Damain httn/commans.wikimedortwhdechaPeurid-10M Number Name Function 1 3. 4 6. 7 8 00 000 00 2.Myofibis in muscle fibres are made up of repeating units of dark and light bonds calledDescribe the sequence of events involved in myosincross-bridge attachment and detachment. Relate theseevents to how muscles generate force and shorten when theyare stimulated to contract, identifying the role that ATP plays.