Nokea
A dendrite conducts nerve impulses ________ the cell body.
- A. away from
- B. toward
- C. both toward and away from
- D. around, bypassing
Correct Answer: B
Rationale: Dendrites are specialized structures that receive nerve impulses from other neurons and conduct them toward the cell body. They are branched extensions that increase the surface area for receiving signals. The electrical signals generated by neurotransmitters binding to receptors on dendrites travel toward the cell body, where they are integrated to determine whether the neuron will fire an action potential. This directional flow is essential for neural communication.
You may also like to solve these questions
When assessing a patient's response to stimuli, the nurse should:
- A. Observe for changes in the patient's reaction to verbal and physical stimuli.
- B. Measure the patient's heart rate.
- C. Inspect the patient's skin for lesions.
- D. Check the patient's blood pressure.
Correct Answer: A
Rationale: Response to stimuli is assessed by observing the patient's reaction to verbal and physical stimuli. Heart rate, skin lesions, and blood pressure are unrelated to this assessment.
The nurse notes that a patient is not able to voluntarily move the right arm. Which part of the brain should the nurse suspect is affected in this patient?
- A. Cerebellum
- B. Frontal lobe
- C. Parietal lobe
- D. Hypothalamus
Correct Answer: B
Rationale: The frontal lobes contain the motor areas that generate the impulses that bring about voluntary movement. Each motor area controls movement on the opposite side of the body. The cerebellum is responsible for coordination and balance, while the parietal lobe processes sensory information. The hypothalamus regulates autonomic functions and is not directly involved in voluntary movement.
Which of the following nursing interventions is taken as a precautionary measure if shock develops when a client with spinal cord injury is hospitalized?
- A. An IV line is inserted to provide access to a vein.
- B. Head and back are immobilized mechanically with a cervical collar and back support.
- C. Traction with weights and pulleys is applied.
- D. A turning frame is used.
Correct Answer: A
Rationale: IV access is critical for administering fluids and medications in shock.
In counseling patients with spinal cord lesions regarding sexual function, how should the nurse advise a male patient with a complete lower motor neuron lesion?
- A. He is most likely to have reflexogenic erections and may experience orgasm if ejaculation occurs
- B. He may have uncontrolled reflex erections but orgasm and ejaculation are usually not possible
- C. He has a lesion with the greatest possibility of successful psychogenic erection with ejaculation and orgasm
- D. He will probably be unable to have either psychogenic or reflexogenic erections and no ejaculation or orgasm
Correct Answer: B
Rationale: Lower motor neuron lesions result in uncontrolled reflex erections.
True statements about aldosterone include:
- A. it increases the amount of Na+-K+ ATPase in the target cells
- B. it reduces the sodium content of the sweat
- C. it increases the acidity of urine
- D. all above
Correct Answer: D
Rationale: Aldosterone increases Na+-K+ ATPase activity in target cells, promoting sodium reabsorption and potassium excretion. It also reduces sodium loss in sweat and increases urine acidity by promoting hydrogen ion excretion. These actions help regulate electrolyte balance and blood pressure.