An action potential in a presynaptic neuron induces opening of voltage-gated ____________________ channels in the synaptic knob, which triggers exocytosis of synaptic vesicles
Fill in the blank(s) with correct word
Na+
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For the structures listed below, choose one of the following:
1. cerebral cortex 2. limbic system 3. corticospinal tracts 4. ventral horn 5. basal ganglia 6, corpus callosum A. structure is composed of gray matter B. structure is composed of white matter
Which of the following is not true of cardiomyocytes?
A. They usually have one nucleus. B. Mitochondria make up about 2% of the cell volume. C. They are joined by intercalated discs. D. They have T tubules that admit extracellular calcium. E. They are striated.
What is the only known factor that increases thyrotropin-releasing hormone (and, accordingly, TSH and thyroid hormone secretion)?
a. exposure to cold in adults b. exposure to cold in newborn infants c. extreme emotional stress d. starvation e. physical trauma
Which of the following is an indication of melanoma?
A) a symmetrical mole B) a pigmented spot that has smooth borders C) a pigmented spot on the skin that is smaller than the size of a pencil eraser D) a pigmented spot that is all black E) a pigmented spot that contains areas of different colors