Exam 8: Nervous Tissue

In Fig. Img_003, a patient who has a stroke involving this region of the central nervous system has damage to her

Major dense lines of a myelinated axon

When an action potential reaches the presynaptic membrane, it causes the opening of certain voltage-gated ion channels that permit the influx of specific ions, which causes synaptic vesicles to fuse with the presynaptic membrane and release their neurotransmitter substances via exocytosis into the synaptic cleft. These voltage-gated ion channels permit the

A 42-year-old patient presents with Huntington chorea. Which of the following neurotransmitter-producing cells is believed to be missing?

Identify the structure

An elderly patient is seen by his gerontologist and asks what the blood-brain barrier is and why certain drugs cannot enter the neural tissue. The physician explains that the principal anatomic structure that creates that barrier is the

Hospitalized patients can contract herpesvirus infections from each other because of

A patient with Hirschsprung disease has a developmental condition that involves

A patient presents with muscular rigidity, constant tremor, slow movement (bradykinesia), difficult voluntary movements, and rigid, mask-like features. Which neurotransmitter is lacking in this patient's brain?

The region within the rectangle is the

A second-year medical student, seen in the student health clinic, is disoriented and has fever, headache, and a stiff neck. The physician should suspect

Identify the cell at the tip of the arrow

The nervous system has neurons as well as associated neuroglia. Which one of the following neuroglia is derived from cells of the bone marrow?

The neuron that is not present in a two-neuron reflex arc is known as a(n)

A 43-year-old patient who had an infection with Campylobacter jejuni 2 weeks earlier presents with lower back pain that progressed to muscle weakness and lack of sensation first in the lower then in the upper extremities. The physician suspects Guillain-Barré syndrome, a disease that is

A patient presents in the emergency department with a knife wound to the arm. It is noted that some of the muscles of his arm are paralyzed. Which of the following will take place in the neurons whose axons were severed?

Identify the cell at the tip of the arrow

Maintenance of the resting potential depends primarily on

A patient is diagnosed with lockjaw. The tetanus toxin was transported from the periphery to the central nervous system by

The nervous system has neurons as well as associated neuroglia. Which one of the following neuroglia participates in the formation of the choroid plexus?