The porcupinefish produces a toxin that binds voltage-gated sodium channels. Determine the effect of the toxin on nerve function
What will be an ideal response?
The axon of the neuron would be unable to generate action potentials. The activation of voltage-gated sodium channels is critical for the influx of sodium ions into the cell along their electrochemical gradient. Depolarization is dependent upon the influx of sodium ions (to about +30 mV).
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The nervous system and the endocrine system are the major control systems of the body.
Indicate whether the statement is true or false.
The foramen ovale is an opening that allows fetal blood to pass from the
A. right ventricle to the left ventricle. B. left ventricle to the right ventricle. C. right atrium to the left atrium. D. left atrium to right atrium.
Which of the following tracts is correctly matched?
A) superior cerebellar peduncles: link cerebellum with nuclei in the spinal cord B) middle cerebellar peduncles: link cerebellum with nuclei in the pons C) inferior cerebellar peduncles: link cerebellum with nuclei in the cerebrum D) superior cerebellar peduncles: link cerebellum with nuclei in the medulla oblongata E) inferior cerebellar peduncles: link cerebellum with nuclei in the midbrain
Which of the following variables affects angular momentum?
A. linear velocity B. angular acceleration C. both A and B D. neither A nor B