Nokea
Communication within neurons is ______, communication between neurons is ________.
- A. excitatory, inhibitory
- B. inhibitory, excitatory
- C. chemical, electrical
- D. electrical, chemical
Correct Answer: D
Rationale: Communication within neurons is electrical, involving the propagation of action potentials along the axon. Communication between neurons, however, is chemical, relying on the release of neurotransmitters at the synapse. This combination of electrical and chemical signaling allows for rapid and precise communication within the nervous system, enabling complex behaviors and cognitive processes.
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The Schwann cells form a myelin sheath around the:
- A. dendrites
- B. cell body
- C. nucleus
- D. axon
Correct Answer: D
Rationale: Schwann cells are responsible for forming the myelin sheath around axons in the peripheral nervous system (PNS). Dendrites, cell bodies, nuclei, and nodes of Ranvier are not directly myelinated by Schwann cells. Therefore, D is the correct answer.
The tiny space between neurons or a neuron and its target muscle is the:
- A. dendrite
- B. axon
- C. neuron cell body
- D. synapse
Correct Answer: D
Rationale: The synapse is the tiny gap between neurons or between a neuron and its target cell, such as a muscle. It is the site where neurotransmitters are released to transmit signals from one cell to another. When an action potential reaches the axon terminal, neurotransmitters are released into the synapse and bind to receptors on the postsynaptic cell, triggering a response. The synapse is crucial for communication within the nervous system.
As the potassium ions move out of the axon, the oscilloscope records a ________.
- A. depolarization
- B. repolarization
- C. equalizing of negative and positive ions
- D. shutdown of the membrane pumps
Correct Answer: B
Rationale: As potassium ions move out of the axon during repolarization, the oscilloscope records a return of the membrane potential to its negative resting state. This phase of the action potential is called repolarization and is essential for resetting the neuron so it can fire another action potential. Repolarization ensures that the neuron is ready to transmit subsequent nerve impulses.
A person comes to the clinic reporting, I wear a scarf across my lower face when I go out but because of my ugly appearance. Assessment reveals an average appearance with no actual disfigurement. Which problem is most likely?
- A. Dissociative identity disorder
- B. Body dysmorphic disorder
- C. Pseudocyesis
- D. Malingering
Correct Answer: B
Rationale: The correct answer is B: Body dysmorphic disorder. This individual's distorted belief about their appearance despite no actual disfigurement aligns with the symptoms of body dysmorphic disorder. People with this disorder obsess over perceived flaws in their appearance.
Incorrect choices:
A: Dissociative identity disorder involves multiple distinct personality states, not related to body image.
C: Pseudocyesis is a false belief of being pregnant, unrelated to body image.
D: Malingering involves feigning symptoms for external gain, not related to distorted body image perceptions.
The nurse is assisting a neurologist with assessment of a patient with facial muscle weakness. When the neurologist asks the patient to identify different odors, which nerve is being tested?
- A. II (optic)
- B. X (vagus)
- C. I (olfactory)
- D. VIII (acoustic)
Correct Answer: C
Rationale: Cranial nerve I (olfactory) is responsible for the sense of smell and is tested when a patient is asked to identify odors. Cranial nerves II, VIII, and X are involved in vision, hearing, and autonomic functions, respectively. Assessing the olfactory nerve is important for evaluating cranial nerve function.