Exam+2+--+Spring+2004+_Practice_+--+Blank - Bio 225 Spring...

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Bio 225 Spring Term 2004 Practice Exam II 1. Name the characteristics of neuron structure and function that play crucial role in unidirectional and rapid transmission of electrical signal (action potential). 2. Describe the unique characteristics of Action Potential (4 things). 3. Match the function with correct structure. a. Dendrite 1. Initiation of AP b. axon 2. Reception of information c. axon hillock 3. intracellular trafficking d. internode 4. chemical propagation of AP e. synapse 5. facilitates saltatory propagation of AP f. cytoskeleton (microtubules) 6. Electrical propagation of AP 4. Dendrite spines a. Are the site of signal reception b. Release neurotransmitters c. Are the site of transcription for protein synthesis d. A and C e. None of the above 5. An action potential that travels down the length of axon originates in the a. Axon b. Dendrite ending (tip) c. Dendrite base d. Axon hillock e. Cell body 6. The blood brain barrier is formed by a. Astrocytes b. Oligodendrocytes 7. myelin sheath of the central nervous system (CNS) is formed by a. astrocytes b. oligodendrocytes c. microglia d. Schwann cells
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8. Based on the knowledge gained in lectures, describe what physiological function will be affected by deficiency of each of the following in our diet. a. Iodine b. Na+ c. K+ d. Ca++ 9. Which of the following ions are not crucial for smooth muscle contraction? a. Na+, K+, Ca2+ b. Ca2+, Cl-, K+ c. Na+, K+, Cl- d. All of the above 10. Which of the following is essential for skeletal muscle relaxation? a. Inactivation of voltage-gated Na+ channels on sarcolemma. (no more neuronal siganal) b. Inactivation of Ca2+ release channels on sarcoplasmic reticulum (no more Ca2+ to expose actin binding sites), part of intracellular concentration of Ca2+ restoration c. Activity of Ca2+-ATPase pump d. Opening of K+ channels e. a, b and c f. a, b and d 11. Which of the following is responsible for the absolute refractory phase following
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This note was uploaded on 07/11/2011 for the course BIOLOGY 225 taught by Professor Pavgi during the Spring '10 term at University of Michigan.

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Exam+2+--+Spring+2004+_Practice_+--+Blank - Bio 225 Spring...

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