BIO 152/A & P 2 PORTAGE LEARNING EXAM FINAL BIOD 152 EXAMS QUESTIONS AND ANSWERS

BIOD 152/A& P2 PORTAGE LEARNING EXAMF jl jl jl jl jl jl jl jl




INAL BIOD 152 EXAMS QUESTIONS AND jl jl jl jl jl jl




ANSWERS


This is a bundle of axons found in the peripheral nervous system. - Answer Nerve
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This part of the autonomic system increases digestion. - Answer Parasympathetic
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The dorsal root of a nerve contains what type of neurons? - Answer Sensory (afferent)
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This part of a neuron conducts nerve impulses away from the cell body. - Answer Axon
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A neuron going to the bicep of the forearm is part of the:
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A. central nervous system jl jl


B. peripheral nervous system jl jl


C. Autonomic system jl


D. Somatic system jl


E. A&C
F. B&D - Answer F. B&D jl jl jl jl




The neuron pictured, below, is best described as:
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A. Bipolar
B. Multipolar
C. Unipolar
D. Pseudounipolar - Answer B. Multipolar jl jl jl jl




True or false: Neurons do not physically touch one another. - Answer True
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Describe the synthesis and storage of neurotransmitters. - jl jl jl jl jl jl jl


Answer The neuron cell body manufactures neurotransmitters, which are stored in secretor
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y vesicles at the end of axon terminals
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An efferent neuron carries information:
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A. From the central to the peripheral nervous system
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B. From the peripheral to the central nervous system
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C. Within the central nervous system jl jl jl jl


D. Within the peripheral nervous system - jl jl jl jl jl


Answer A. From the central to the peripheral nervous system
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A postsynaptic neuron would be found:
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A. before the synapse jl jl


B. after the synapse jl jl




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,C. inside the synapse jl jl


D. Only in the central nervous system - Answer B. after the synapse
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What is the location and function of Satellite cells? -
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Answer Location: peripheral nervous system (PNS)
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Function: Regulation of environment of neuron cell bodies jl jl jl jl jl jl jl




A patient's spinal cord was severed in a car accident. W ould the patient be expected to regr
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ow axons in their spinal cord? Why or why not? -
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Answer No, only the peripheral system axons are capable of regeneration. The spinal cor
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d is the central nervous system
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Name and describe what is occurring in the neuron cell membrane in section 4 of the diagra
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m. Include the charge of the membrane during this phase. -
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Answer This is phase 4: afterpolarization (hyperpolarization), the potassium gates are slow
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to clse and that results in an undershoot of the potential, the voltage will drop below -
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70mV and the return to the restign state beings.
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At rest, a neuron plasma membrane is:
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A. -70 mV jl


B. +40 mV jl jl


C. Hyperpolarized
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D. Depolarized - Answer A. -70 mV
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Which of the following is false concerning the sodium-potassium pump?
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A. it maintains the resting phase of an axon
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B. For every three sodium ions pumped out, two potassium ions are pumped in
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C. it must remain in constant operation to maintain the resting state
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D. The overall effect is a negative charge on the outside of the membrane -
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Answer D. The overall effect is a negative charge on the outside of the membrane
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True or false: A sensory neuron is signaling the body of extreme pain. This means that the s
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trength of the action potential is greater than usual. Explain your reasoning -
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Answer False, there is no variation in the strength of action potentials. (It is an all-or-
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nothing response). There is variation in the number and frequency of neurons firing
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Which of the following statements is false concerning the neuromuscular junction?
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A. Sodium ions release from the presynaptic motor neuron
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B. Calcium ions release from the sarcoplasmic reticulum to cause muscle contraction
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C. Sodium channels open on the muscle fibers in response to the neurotransmitter
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D. The NMJ is found in the peripheral nervous system -
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Answer A. Sodium ions release from the presynaptic motor neuron
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What prevents continuous stimulation of a nerve synapse and how is this accomplished? -
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Answer The short extension of neurotransmitters in the synpase
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, prevents coninous stimulation. Some synapses contain enzymes that rapidly inactivate neu
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rotransmitters and other synpases rapidly absord the neurotransmitters. jl jl jl jl jl jl jl




What neurotransmitter is found at the neuromuscular junctions? - Answer Acetylcholine (ACh)
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True or False: Action potentials travel in multiple directions within the same neuron. -
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Answer False (only one direction in the same neuron)
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True or False: Reflexes occur only with conscious intervention from the brain - Answer False
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Fill in the blank: In a reflex, the
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neuron conducts nerve impulses along a p jl jl jl jl jl jl


athway towards the central nervous system. - Answer sensory (afferent)
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Where is the integration center of a reflex located? - Answer CNS (central nervous system)
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Which of the following is false about reflexes? jl jl jl jl jl jl jl


A. Reflexes do not require higher levels of voluntary processing from the brain B.Regulation of
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blood sugar by hormones is one example of a reflex
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C. Some reflexes can be tested to determine injury
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D. Pulling a hand away from a hot flame is not a reflex; it is entirely voluntary - Answer
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D. Pulling a hand away from a hot flame is not a reflex; it is entirely voluntary
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What is false about the stretch reflex? jl jl jl jl jl jl


A. the effect of the motor signal is to relax a muscle
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B. The patellar reflex test the stretch reflex of the quadriceps femoris
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C. The muscle is spindle detects stretch within the muscle jl jl jl jl jl jl jl jl


D. Stretch reflexes help to decrease the stretch on a muscle - jl jl jl jl jl jl jl jl jl jl


Answer A. The effect of the motor signal is to relax a muscle
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What is true about the flexor withdrawal reflex?
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A. It does not involve interneurons
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B. It involves excitatory interneurons
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C. It involves inhibitory interneurons
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D. The effect of the reflex is to create a co-contraction of two muscles
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E. A&D
F. B& C - Answer F. B&C jl jl jl jl jl




Your doctor taps on your patellar tendon. List out the steps, in detail, of the nervous pathwa
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y of the reflex he is testing. Include any sensory organs involved and the action of the reflex.
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Answer Stretch reflex: Stretch on patellar tendon (tapping patellar tendon), muscle spindl
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e detects stretch, afferent (sensory) neuron through the DRG, spinal cord, synapses direct
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ly on a motor neuron (efferent)
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