Nokea
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.
You may also like to solve these questions
The nurse is caring for a client with ICP. Why will the nurse position the client in bed with HOB elevated to 30 degrees?
- A. Makes it easier for the client to breathe
- B. Prevents the Valsalva maneuver
- C. Promotes venous drainage
- D. Reduces pain
Correct Answer: C
Rationale: Elevating the head of the bed to 30 degrees promotes venous drainage from the brain, reducing intracranial pressure (ICP). This position helps improve cerebral perfusion and prevents complications associated with increased ICP, such as brain herniation.
To assess the patient's deep tendon reflexes, the nurse should:
- A. Use a reflex hammer to test responses in the biceps, triceps, and patellar tendons.
- B. Measure the patient's temperature.
- C. Inspect the patient's gait.
- D. Check the patient's level of consciousness.
Correct Answer: A
Rationale: Deep tendon reflexes are tested using a reflex hammer to elicit responses in specific tendons. Temperature, gait, and level of consciousness are unrelated to reflex testing.
Regarding the cutaneous nerve supply to arm and forearm
- A. C3/4 supply pectoral and upper shoulder
- B. Branches of the brachial plexus supply arm and forearm
- C. C4/5/6/T1 supply the majority of the arm
- D. ?
Correct Answer: B
Rationale: The brachial plexus, formed from C5-T1, supplies the cutaneous innervation of the arm and forearm. Specific branches include the median, ulnar, and radial nerves.
A patient with a fractured femur experiences the complication of malunion. The nurse recognizes that what happens with this complication?
- A. The fracture heals in an unsatisfactory position.
- B. The fracture fails to heal properly despite treatment.
- C. Fracture healing progresses more slowly than expected.
- D. Loss of bone substances occurs as a result of immobilization.
Correct Answer: A
Rationale: Malunion refers to a healed fracture in an incorrect alignment or position.
What kind of loss does the nurse recognize this to be?
- A. Delirium
- B. Memory loss in AD
- C. Normal forgetfulness
- D. Memory loss in mild cognitive impairment
Correct Answer: C
Rationale: Forgetting names and birthdays is typical of normal forgetfulness