Nokea
The Broca's area is located in the lobe:
- A. frontal
- B. parietal
- C. temporal
- D. occipital
Correct Answer: A
Rationale: Frontal lobe is the correct answer because Broca's area, which is responsible for speech production and language processing, is located in the posterior part of the frontal lobe, typically in the left hemisphere. Damage to this area results in Broca's aphasia, characterized by non-fluent speech and difficulty forming sentences.
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In reviewing Mrs. Post's laboratory results, which abnormal test is most likely to confirm the diagnosis?
- A. Sedimentation rate
- B. Rheumatoid factor
- C. LE cells
- D. Antinuclear antibody
Correct Answer: D
Rationale: Antinuclear antibodies are highly indicative of systemic lupus erythematosus.
If an individual suffers a traumatic event and has a neurological disorder that means they may be unable to recall anything from the moment of the injury or to retain memories of recent events. This is known as:
- A. anterograde amnesia
- B. retrograde amnesia
- C. postevent amnesia
- D. antenatal amnesia
Correct Answer: A
Rationale: Anterograde amnesia refers to the inability to form new memories after the onset of amnesia, often due to brain injury or trauma. This condition severely impacts an individual's ability to retain information about recent events, while memories from before the injury may remain intact. It is commonly associated with damage to the hippocampus, a brain region critical for memory formation and consolidation.
A 70-year-old patient is admitted after falling from his roof. He has a spinal cord injury at the C7 level. What findings during the assessment identify the presence of spinal shock?
- A. Paraplegia with a flaccid paralysis
- B. Tetraplegia with total sensory loss
- C. Total hemiplegia with sensory and motor loss
- D. Spastic tetraplegia with loss of pressure sensation
Correct Answer: A
Rationale: Flaccid paralysis below the level of injury indicates spinal shock.
The 'sodium-potassium pump' pumps ___________.
- A. sodium ions out and potassium ions in
- B. sodium ions in and potassium ions out
- C. sodium and potassium ions in
- D. sodium and potassium ions out
Correct Answer: A
Rationale: The sodium-potassium pump is a membrane protein that actively transports sodium ions out of the neuron and potassium ions into the neuron. This process requires energy in the form of ATP and helps maintain the resting membrane potential. By creating a concentration gradient of these ions, the pump ensures that the neuron is ready to generate action potentials and transmit nerve impulses efficiently.
The action potential of a neuron
- A. is initiated by efflux of Na+
- B. is terminated by efflux of K+
- C. declines in amplitude as it moves along the axon
- D. results in a transient reversal of the concentration gradient of Na+ across the cell membrane
Correct Answer: B
Rationale: The action potential is initiated by the influx of Na+ through voltage-gated sodium channels, causing depolarization. It is terminated by the efflux of K+ through voltage-gated potassium channels, leading to repolarization. The action potential does not decline in amplitude as it propagates along the axon (all-or-none principle), and there is a net movement of Na+ and K+ across the membrane during the process.