COMPREHENSION QUESTIONS 1. Which of the following enzymes catalyzes the synthesis of ACh? a. Acetyl-coenzyme A b. Acetylcholinesterase (AChE) c. Acetylcholine-H(ACh-H) exchanger d. Amino acid decarboxylase e. Choline acetyltransferase 2. Which of the following is the most common action of -aminobutyric acid (GABA): a. Opening channels permeable to Cl− b. Opening channels permeable to Ca2 c. Opening channels permeable to Naand K d. Closing channels permeable to Na e. Closing channels permeable to Cl−and K 3. Which of the following statements distinguishes excitatory chemical synapses in the brain from the neuromuscular junction? a. Excitation is produced by ligand-gated channels. b. Ligand-gated channels increase permeability to both Naand K. c. Postsynaptic action potentials are triggered when a sufficient number of voltage-gated Nachannels are opened by an EPP or by summating EPSPs. d. Temporal summation and spatial summation onto the postsynaptic cell increase the likelihood that a postsynaptic action potential will be evoked. e. The synaptic reversal potential is close to 0 mV. Answer 1. E 2. A 3. D طبعا الاجابات موجوده بتاعه الاسئله بس الناس سألت على السؤال التانى و التالت السؤال الثانى الماده اللى اسمها GABA دى شغلتها تقفل Cl channels و هى ماده بتعمل inhibition of NMT السؤال الثالث بقولك ايه اللى بيفرق ال excitation فى ال brain عنه فى ال NMT و الاجابه معناها ان يمكن حدوث temporal & spatial summation in NMT to increase excitability
Posted on: Sat, 27 Dec 2014 19:00:30 +0000
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