key midterm2-10

key midterm2-10 - Name _________________________ 1 Biology...

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Unformatted text preview: Name _________________________ 1 Biology 125 Midterm #2 (11-16-10) Part 1:_____ ________ (30 pts) Part 2:______________ (40 pts) Part 3: _____________ (8 pts) Part 4: _____________ (6 pts) Part 5: ____________ (16 pts) Total Score: ___________ (100 pts) Total Pages: 9 Name _________________________ 2 Part 1: True or False. Circle (T) if the statement is true or (F) when the statement is false. (2 points each, 30 points total) 1. (T) Multiple EPSPs arriving at slightly different time and on different dendritic branches can summate and help bring a neuron to threshold. 2. (F) The most important factor determining whether a receptor-operated ion channel is inhibitory or excitatory is whether the permeant ion is positively or negatively charged. 3. (T) Neurons in the dorsal stream of the extrastriate visual cortex process information about the location and movement of objects in the visual field. 4. (F) NMDA receptors allow passage of large amounts of chloride and calcium when activated. 5. (F) Cocaine acts by blocking AMPA receptors. 6. (T) Peptide neurotransmitters are often released together with small molecule transmitters. 7. (F) The dorsal lateral geniculate nucleus receives inputs only from the contralateral eye in humans. 8. (T) The dorsal columns refer to the white-matter columns on the dorsal side of the spinal cord. 9. (T) In the primary somatosensory cortex, in general, each part of the body is represented in an area of the cortex roughly proportional to its degree of innervation. 10. (T) Regarding the conduction velocity, the axons arising from the peripheral nociceptors include the slowest conducting of the peripheral sensory afferents. 11. (F) Referred pain results when cutaneous sensory neurons send aberrant axonal branches to visceral organs. 12. (T) The placebo effect can be blocked by naloxone, an opioid receptor antagonist. 13. (T) Glycine is commonly used in the spinal cord where it hyperpolarizes the post-synaptic cell. 14. (F) The optic disc contains only cones and has the highest visual acuity. 15. (T) With respect to mechanosensory receptors, the quality of a stimulus (what it represents and where it is) is determined by both the relevant receptors being activated and the neuron’s targets in the brain. Name _________________________ 3 Part 2: Choose the best answer for the following multiple-choice questions. (2 points each, 40 points total) 1. Which of the following retinal neurons fire action potentials: A. Rods and cones B. Bipolar cells C. Amacrine cells D. Horizontal cells E. None of the above 2. When a muscle is held at a voltage of 0 mV at the neuromuscular end plate, acetylcholine no longer produces a current because A. the acetylcholine receptor channels all close instantly at 0 mV....
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key midterm2-10 - Name _________________________ 1 Biology...

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