Nokea
An action potential:
- A. is essential for nerve impulse propagation
- B. involves the influx of negative ions to depolarize the membrane
- C. involves the outflux of negative ions to depolarize the membrane
- D. involves the outflux of positive ions to depolarize the membrane
Correct Answer: A
Rationale: An action potential is essential for nerve impulse propagation, as it is the electrical signal that travels along the neuron. It involves the influx of positive sodium ions to depolarize the membrane, not negative ions or potassium ion movements. Therefore, A is the correct answer.
You may also like to solve these questions
Radicular pain that radiates down the buttock and below the knee, along the distribution of the sciatic nerve, generally indicates what?
- A. Cervical disc herniation
- B. Acute lumbosacral strain
- C. Degenerative disc disease
- D. Herniated intervertebral disc
Correct Answer: D
Rationale: Sciatica is caused by nerve root compression from a herniated disc.
A 71-year-old patient has had PD for 8 years and is currently taking pramipexole 1.5 mg three times a day and carbidopa/levodopa 25/100 mg four times a day. His wife claims that he is complaining of seeing spiders and bugs running across the floor and imaginary children in their house. The first thing to do is:
- A. Increase the pramipexole dose.
- B. Reduce the pramipexole dose.
- C. Increase the carbidopa/levodopa dose.
- D. Reduce the carbidopa/levodopa dose.
Correct Answer: B
Rationale: Hallucinations in PD patients are often a side effect of dopamine agonists like pramipexole. Reducing the dose can help alleviate these symptoms.
During muscle strength testing, the patient has active movement against gravity and some resistance to pressure. What score should the nurse give this finding?
- A. 2
- B. 3
- C. 4
- D. 5
Correct Answer: C
Rationale: Grade 4 indicates movement against gravity and moderate resistance.
Within how many hours does tissue plasminogen activator (TPA) need to be given to be most successful for a client with an ischemic stroke?
- A. 6 hours
- B. 3 hours
- C. 8 hours
- D. 10 hours
Correct Answer: B
Rationale: TPA is most effective when administered within 3 hours of stroke onset.
Dysdiadochokinesia refers to ___________.
- A. inability to walk
- B. excessive movements of the appendages
- C. ignoring one side of the body opposite brain damage
- D. inability to do alternating movements
Correct Answer: D
Rationale: Dysdiadochokinesia is the inability to perform rapid alternating movements, such as pronation and supination of the hand. It is often a sign of cerebellar dysfunction, which affects motor coordination.