C acetylcholine is released into the synaptic cleft

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Unformatted text preview: 100% 0% C. External control through the nervous system. 0% D. Hormones Score: 0% 0.5/0.5 5. which of the following is responsible for crude (non-descriminative) touch? Student Response Value A. Pacinian corpuscle 0% B. Meissner's corpuscle 100% C. histiocyte 0% D. Langihans cell 0% Feedback Na+ is pumped out, K+ in at 3:2 producing unequal distribution which leads to a polarized membrane, ~ -65mv.1) An impulse arrives at the neuromuscular junction causing Ca+2 to enter the axon terminus. 2) Ca+2 causes exocytosis of Ach vesicles into synaptic cleft. 3) Ach diffuses across the synapse to contact post-synaptic receptors on the sarcolemma. Ach causes Na+ to enter sarcolemma causing depolarization. 4) If depolarization is threshold a new impulse is produced on the sarcolemma by depolarization of voltage-regulated ion gates. 5) Sarcolemma repolarizes, K+ leaves the cell, pump restores distribution.6) Achase (a.k.a. ACh-E) breaks down Ach so the NMJ can function again. Histology 1. The relationship between the alpha-helix structure of proteins and their function as structural components in tendons and ligaments is described as: (A) negative feedback, (B) principle of complementarity, (C) secondary level of protein structure, (D) all of the above, (E) B and C only. 2. The control mechanism maintaining the normal level of a substance or process in would be: (A) negative feedback, (B) positive feedback. 3. Which type of feedback might temporarily oppose homeostasis? (A) negative feedback, (B) positive feedback. 4. The control mechanism activated to produce a rapid response would be: (A) negative feedback, (B) positive feedback. 5. The anatomical level which is composed of different tissues working together is the: (A) cell, (B) tissue, (C) organ, (D) system. 6. The skin, capillary walls, and the lining of the intestine are all example of which basic function of life? (A) molecular transport, (B) movement, (C) maintaining boundaries, (D) metabolism. 7. Most of the respiratory tract has a lining of: (A) simple columnar epithelium, (B) simple squamous epithelium, (C) pseudostratified ciliated columnar epithelium, (D) serous membrane. 8. The most complex (has the most components) of the epithelial membranes is the: (A) serous membrane, (B) mucous membrane, (C) synovial membrane. 9. Mesenteries are made of ____________ which connect and lubricate movement of the intestinal organs. (A) serous membrane, (B) mucous membrane, (C) synovial membrane. 10. The basic types of tissue into which all specific tissues fall include all the following except: (A) connective, (B) serous, (C) mesoderm, (D) nervous, (E) muscular. 11. All epithelial cells have: (A) a basement membrane, (B) cell junctions, (C) microvilli, (D) all of the above, ( E) A and B only. 12 through 16 Matching: Use each answer once only. (A) desmosomes, (B) tight junctions, (C) basement membrane, (D) gap junctions, (E) microvilli, 12. These anchor the cell's basal surface. C 13. These increase the surface area for secretion and absor...
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This note was uploaded on 01/29/2013 for the course BIOL 239 taught by Professor Swan during the Fall '12 term at New Mexico.

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