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BIO 256 EXAM 2 (Latest Update) Questions and Verified Answers (100% Guaranteed Pass). The neuroglia forming the myelin sheath around neuron fibers in the peripheral nervous system are Schwann cells (neurilemma). The threshold membrane potential value for a neuron to initiate an acti...

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  • March 9, 2025
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BIO 256 EXAM 2 (Latest Update) Questions and
Verified Answers (100% Guaranteed Pass).

The neuroglia forming the myelin sheath around neuron fibers in the peripheral nervous system are

Schwann cells (neurilemma).




The threshold membrane potential value for a neuron to initiate an action potential is ________ mV. -55




What is the importance of the axon hillock, the first stretch of membrane on the neuron's axon?

it contains a high concentration of voltage gated channels




Which of the following would result in membrane depolarization influx

of sodium ions




In a resting neuron, the membrane potential is approximately

-70 mV.




Cell A and cell B are located side by side within the same tissue but are not in direct contact with each
other. Cell A releases a chemical messenger. In order for cell B to respond to this chemical messenger
cell B must have receptors specific for the paracrine regulator.

,Why is synaptic transmission the rate limiting (slowest) step of neural conduction?

All of these options are correct.




In general, do unmyelinated small diameter neuron fibers transmit information faster than larger
myelinated fibers?

No. Large diameter myelinated neurons are faster than small diameter unmyelinated neurons.




In a synapse, synaptic vesicles are released from the presynaptic

axon.




Indirect-acting neurotransmitters act through second

messengers to promote long-lasting effects.




The role of acetylcholinesterase is to destroy acetylcholine shortly

after its release by the axonal endings.




A neural circuit with input traveling along several pathways for integration by several CNS systems and
providing several response is a parallel processing circuit.




Brain wave amplitude on an EEG reflects the

number of neurons firing synchronously.

, When most dreaming takes place, your sleep is characterized by temporary

skeletal muscle paralysis, except for the extrinsic eye muscles.




Which of the following structures is probably NOT directly involved in memory?

medulla oblongata




Inhibition of the reticular activating system results in sleep.




Which is true about PET scans?

They detect increased or decreased metabolic activity by measuring the uptake of radioactive
deoxyglucose




Which stimulates inspiration?

pons apneustic center




Which is innervated by the somatic nervous system?

skeletal muscle




Autonomic ganglia contain cell

bodies of postganglionic neurons In

the autonomic nervous system,

nicotinic cholinergic receptors

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