A and P Test on chapters 12& 13 1. Graded potentials occur mainly in and cell bo

Question

A and P Test on chapters 12& 13 1. Graded potentials occur mainly in and cell body of a neuron - they do not travel down the axon a. Dendrites b. Synaptic nob c. Neurolite cells 2. After initiating an action potential, there is a period of time called the a cell cannot generate another AP, no matter how strong the stimulus. during which a. b. c. Relative refractory period Absolute refractory period Summate refractory period 3. True or False: The speed of an AP is also affected by axon diameter 4. True or False: The speed of an AP is also affected by the amount of myelination 5. When considering conduction of AP, which of these would allow the AP to spread down every aspect of the axon before it dies out. a. Saltatory conduction b. Continuous conduction True or False: Neuroglia (glial cells) play a major role in support and nutrition of the brain, and they are involved in sending information. 6. 7. True or False: Most signals that stimulate muscles to contract and glands to secrete originate in the CNS The PNS is further divided into: A somatic nervous system (SNS), an autonomic nervous system (ANS) and an enteric mervous system (ENS). 8. Which of these conveys information from sensory receptors in the head, body wall and limbs towards the CNS a. b. c. d. e. Sensory (efferent) neurons Motor (afferent) neurons Interneurons Sensory (afferent) neurons Motor (afferent) neurons 9cot impulses away from the CNS towards the skeletal muscles under voluntary control in the periphery a. Somatic neurons b. Sensory neurons

Explanation / Answer

1) The correct option is a. Dendrites.

Graded potentials occur mainly in the dendrites and cell body of a neuron-they do not travel down the axon.

2) The correct option is b. Absolute refractory period.

The absolute refractory period is a period during the action potential. It corresponds to depolarization and repolarization.

3) The given statement is true.

4) The given statement is true.

The speed of an AP is affected by axon diameter, amount of myelination and temperature.

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