A patient complains of no energy, a chronic sore throat, a low-grade fever, and is tired and achy. His doctor notes an enlarged spleen upon examination. What diagnosis would you expect and what definitive test would you request?
What will be an ideal response?
The test would be a differential white blood cell count to look for elevated numbers of monocytes and atypical lymphocytes. The diagnosis would be possible infectious mononucleosis, pending test results.
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Identify the true statement(s) about sensory receptors:
a. The larger the receptor potential, the greater the frequency of action potentials initiated in the afferent neuron. b. Tonic receptors often exhibit an "off-response." c. Phasic receptors are important in situations where maintained information about a stimulus is valuable. d. Receptor adaptation results from nerve fatigue. e. Receptors are part of efferent neurons.
In the presence of lidocaine, the action potential was NOT affected at R1 because _______.
A) action potential propagation is in one direction B) lidocaine was applied upstream of R1 C) lidocaine doesn't have an effect on the generation of action potentials D) there are no voltage-gated sodium channels to be affected
What is the role of the pleural fluid?
a. Increases heat production during respiration b. Increases risk of infection c. Reduces friction d. Reduces respiratory rate
Which of the following is NOT part of the limbic system?
A. lateral geniculate nucleus of the thalamus B. cingulate gyrus of the cerebral cortex C. dentate gyrus of the hippocampus D. olfactory cortex