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Title: Michael was very anxious and took a valium pill. The valium activated postsynaptic chloride (Cl-) ch Post by: Mira8642 on Nov 21, 2011 Question 21 of 60 1.667 Points
Michael was very anxious and took a valium pill. The valium activated postsynaptic chloride (Cl-) channels in his brain. What would be the effect? A. Raising of the postsynaptic membrane potential. B. Lowering of the presynaptic membrane potential. C. Rapid firing of presynaptic neurons. D. Rapid firing of postsynaptic neurons. E. Lowering of the postsynaptic membrane potential. Reset Selection Question 22 of 60 1.667 Points Baldev has multiple sclerosis, a disease in which nerve cell insulation becomes faulty. If Baldev is having memory problems, what is likely failing? A. Interneurons. B. Oligodendrocytes. C. Spinal motor neurons. D. Schwann cells. E. Dendrites. Reset Selection Question 23 of 60 1.667 Points Deepti works for a pharmaceutical company and is developing a drug that will block sodium channels. What effect would the drug have on a nerve? A. Accelerate depolarization. B. Accelerate saltation. C. Block the membrane potential. D. Increase the action potential. E. Block the threshold potential. Reset Selection Part 8 of 18 - Question 24 of 60 1.667 Points Maya is photographing wildlife including the platypus, and has noticed that it can locate food in muddy streams with its eyes, ears, and nostrils closed. Likely what is it using? A. Magnetic receptors. B. Semicircular canals. C. Cochlear hair cells. D. Pit organs. E. Electroreceptors. Reset Selection Title: Re: Michael was very anxious and took a valium pill. The valium activated postsynaptic chloride (Cl- Post by: bio_man on Mar 31, 2015 Kyla is studying the oxygen use by the livers of seals. She detected a 4 kPa (https://biology-forums.com/index.php?topic=15137.0)
Title: Re: Michael was very anxious and took a valium pill. The valium activated postsynaptic chloride (Cl- Post by: bio_man on Mar 31, 2015 Deepti works for a pharmaceutical company and is developing a drug that will block sodium channels. What effect would the drug have on a nerve? A. Accelerate depolarization. B. Accelerate saltation. C. Block the membrane potential. D. Increase the action potential. E. Block the threshold potential. Reset Selection Increase the action potential. The principal effect of reducing the rate and magnitude of depolarization by blocking sodium channels is a decrease in conduction velocity in non-nodal tissue (atrial and ventricular muscle, purkinje conducting system). The faster a cell depolarizes, the more rapidly adjacent cells will become depolarized, leading to a more rapid regeneration and transmission of action potentials between cells. Therefore, blocking sodium channels reduces the velocity of action potential transmission within the heart (reduced conduction velocity; negative dromotropy) |