s true True or False (20 points: 1002 points each): Indicate whether the state P

Question

s true True or False (20 points: 1002 points each): Indicate whether the state Part A. 1. n efflux of K+ ions depolarizes the membrane of an axon for a neuron v Dendrites are the part of the neuron that provide input or signal reception chwann cells are the primary type of myelinating glial cell associat receptors for neurotransmitters ed with the central nervous system (CNS) itter When an action potential reaches the axon terminal, a quick burst of neurotransm released into the synaptic cleft 5. ed axons a The ascending and descending tracts of the spinal cord containing myelinat found in the gray matter. 6 7. Contraction of smooth muscle cells is driven by binding of calcium to calmodulin Tonic sensory receptors are best at detecting changes in the environment (e.g., onse of stimuli). 8 The dorsal column-medial lemniscal pathway carries mechanoreceptive and propri information to the thalamus, whereas the spinothalamic tract carries thermoreceptive nociceptive information. 9. The proximity of the sarcoplasmic reticulum to each sarcomere permits the nearh simultaneous delivery of calcium to all sarcomeres of the muscle fiber. 10. Binding of ATP to myosin decreases myosin's affinity for actin. Part B. Multiple Choice (80 points: 40@2 pts each): Select the best answer from the choic 11. In which part of the neuron do transcription of genes, synthesis of proteins and in electrical signals (EPSPs and IPSPs) occur? a. Axon terminals b. Dendrites c. Cell body/Soma d. Axon hillock e. Axon

Explanation / Answer

1. False (influx of Na+)

2. True (dendrites are receptor in nature)

3. False (Oligodendrocytes forms myelin sheath in CNS neuron)

4. True (Ach, Dopamine or serotonin)

5. True (outer of the spinal cord is gray matter due to the presence of myelinated axon)

6. True (ion movement during the depolarization phase)

7. False

8. True (DCML - sensory modalities of fine touch (tactile sensation), vibration and proprioception, spinothalamic tract - pain(nociceptor) & Temperature (thermoreceptor))

9. True

10. True

11. Axon (in axoplasm)

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