Which of the following instructions should be given to the client's family if a client with impaired swallowing has to take solid medication?
- A. Mix the medication with food
- B. Use the liquid form of the medication
- C. Check with the physician or pharmacist before crushing or breaking tablets
- D. or opening capsules
Correct Answer: C
Rationale: Not all medications can be safely altered, so consulting healthcare providers is essential.
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The hypothalamus contains cells which are sensitive to:
- A. PO2
- B. arterial blood pressure
- C. [H+]
- D. TSH (thyroid-stimulating hormone) concentration
Correct Answer: D
Rationale: The hypothalamus contains cells sensitive to TSH concentration, which is part of the feedback loop regulating thyroid hormone production. It is not directly sensitive to PO2, arterial blood pressure, or [H+], which are regulated by other mechanisms.
Which of these locations in the forebrain is the master control center for homeostasis through the autonomic and endocrine systems?
- A. hypothalamus
- B. thalamus
- C. amygdala
- D. cerebral cortex
Correct Answer: A
Rationale: The correct answer is A: hypothalamus. The hypothalamus is the master control center for homeostasis as it regulates various bodily functions through the autonomic and endocrine systems. It plays a crucial role in maintaining body temperature, hunger, thirst, sleep, and hormone regulation. The thalamus (B) is responsible for sensory relay, the amygdala (C) is involved in emotion processing, and the cerebral cortex (D) is responsible for higher cognitive functions. Therefore, the hypothalamus is the correct choice for controlling homeostasis in the body.
The human nervous system is capable of a wide range of functions. What is the basic unit of the nervous system?
- A. Glial cell
- B. Meninges
- C. Neuron
- D. Cerebrospinal fluid
Correct Answer: C
Rationale: The neuron is the basic unit of the nervous system, responsible for transmitting information through electrical and chemical signals. Glial cells support neurons, meninges are protective layers around the brain and spinal cord, and cerebrospinal fluid cushions the central nervous system. Understanding the neuron's role is fundamental to studying nervous system function.
Muscle tone is reduced by:
- A. lower motor neurone lesion
- B. curare
- C. cerebellar lesion
- D. all above
Correct Answer: D
Rationale: Muscle tone is reduced by lower motor neuron lesions (flaccidity), curare (which blocks neuromuscular transmission), and cerebellar lesions (hypotonia). All these conditions lead to decreased muscle tone.
The nurse is caring for a patient who is scheduled for a magnetic resonance imaging (MRI) scan. What explanation should be provided to the patient and family?
- A. A scan of the brain will be done after injection of a radioisotope.
- B. An MRI uses electrodes placed on the scalp to measure activity of the brain.
- C. An MRI measures muscle contraction after stimulation by tiny needle electrodes.
- D. An MRI is a noninvasive test that uses magnetic energy to visualize internal parts.
Correct Answer: D
Rationale: An MRI is a noninvasive imaging technique that uses magnetic fields and radio waves to create detailed images of internal structures. It does not involve radioisotopes, electrodes, or needle electrodes. Providing accurate information helps the patient and family understand the procedure.