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A drug is called an agonist if it ________.
- A. blocks a receptor
- B. interferes with neurotransmitter reuptake
- C. acts like the endogenous neurotransmitter by binding to its receptor
- D. blocks the voltage-gated calcium ion channel
Correct Answer: C
Rationale: The correct answer is C because an agonist mimics the action of the endogenous neurotransmitter by binding to its receptor. This leads to activation of the receptor and physiological response. Choice A is incorrect as an agonist does not block a receptor. Choice B is incorrect as it describes a reuptake inhibitor, not an agonist. Choice D is incorrect as it refers to a calcium channel blocker, not an agonist. In conclusion, an agonist activates a receptor by binding to it, unlike the other choices which describe different mechanisms of action.
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Which of these diseases can be prevented with a vaccine for humans?
- A. eastern equine encephalitis
- B. western equine encephalitis
- C. West Nile encephalitis
- D. Japanese encephalitis
Correct Answer: D
Rationale: Step 1: Identify the disease - Japanese encephalitis is caused by a virus transmitted by mosquitoes.
Step 2: Understand the role of a vaccine - a vaccine stimulates the immune system to produce antibodies to fight the virus.
Step 3: Vaccines prevent future infections - by administering a vaccine for Japanese encephalitis, individuals can develop immunity and prevent the disease.
Step 4: Therefore, the correct answer is D because a vaccine is available to prevent Japanese encephalitis.
Summary: A, B, and C are incorrect because there are no vaccines available for eastern equine encephalitis, western equine encephalitis, and West Nile encephalitis, respectively.
In helping Mr. Hall to maintain proper body alignment in bed to prevent dislocation of the prosthetic head and hip contracture, the nurse should assist the patient to lie
- A. straight in bed alternating head position from flat to 30° elevation and left leg abducted
- B. diagonally toward the right side of the bed with legs together
- C. flat on back in bed for first 48 hours with legs adducted
- D. on the right side only with the left leg in front of the right leg
Correct Answer: A
Rationale: This position minimizes stress on the new hip joint.
Cell bodies for the motor supply of the trigeminal nerve lie
- A. Hypothalamus
- B. Midbrain
- C. Posterior to cerebral aqueduct
- D. Cerebral cortex
Correct Answer: B
Rationale: The motor nucleus of the trigeminal nerve is located in the midbrain. It supplies muscles of mastication, such as the masseter and temporalis.
The action potential is measured in millivolts (mV) and is ranged from:
- A. -90mV to +20mV
- B. -70mV to +30mV
- C. -65mV to +40mV
- D. -30mV to +60mV
Correct Answer: C
Rationale: The action potential involves a rapid change in membrane potential, typically ranging from -65mV (resting potential) to +40mV (peak depolarization). This change is driven by the influx of sodium ions and the subsequent efflux of potassium ions. The action potential is a key mechanism for transmitting information within the nervous system, enabling neurons to communicate over long distances.
A client with multiple sclerosis is observed transferring from the bed to a motorized wheelchair and applying splints to the lower extremities before entering the bathroom to perform morning self-care. What could the nurse conclude regarding this observation?
- A. The client uses assistive devices to optimize autonomy.
- B. The client needs instruction to conduct morning care before applying splints to lower extremities.
- C. The client is dependent upon assistive devices.
- D. The client is reliant upon assistive devices for independent.
Correct Answer: A
Rationale: The client's use of assistive devices demonstrates their ability to maintain independence and adapt to their physical limitations.