Exam 11: Fundamentals of the Nervous System and Nervous Tissue

A patient is admitted to the hospital with exacerbation of multiple sclerosis (MS). She asks the nurse, "Why did this have to happen to me again? I was doing so well." Explain why some forms of MS are characterized by periods of remission and exacerbation.

Strong stimuli cause the amplitude of action potentials generated to increase.

Figure 11.1Using Figure 11.1, match the following: -What is the role of microglial cells and why are they so important in the CNS?

Figure 11.1Using Figure 11.1, match the following: -What is the difference between a direct acting neurotransmitter and an indirect acting neurotransmitter?

Which of the following is not a function of the autonomic nervous system?

Which of the following is not characteristic of neurons?

A patient was admitted for depression. What should the nurse explain to the patient regarding the role of serotonin and depression?

An inhibitory postsynaptic potential (IPSP) is associated with .

Figure 11.1Using Figure 11.1, match the following: -Imagine a neuron that has several hundred axonal knobs impinging on it. The majority of these axonal knobs are shown to be "firing." However, the neuron in question does not transmit an impulse. Give a valid explanation of why this could occur.

Figure 11.1Using Figure 11.1, match the following: -Which neuron is never myelinated?

In myelinated axons the voltage- regulated sodium channels are concentrated at the nodes of Ranvier.

Select the correct statement regarding synapses.

Which of the following is true about the movement of ions across excitable living membranes?

The period after an initial stimulus when a neuron is not sensitive to another stimulus is the )

Reflexes are rapid, automatic responses to stimuli.

Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone?

Figure 11.1Using Figure 11.1, match the following: -Which neuron is a sensory neuron found in a reflex arc?

The oligodendrocytes can myelinate several axons.

The substance released at axon terminals to propagate a nervous impulse is called a(n) .

A stimulus traveling toward a synapse appears to open calcium ion channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane.