The principal protein found in the stratum corneum of the epidermis is ________.
Fill in the blank(s) with the appropriate word(s).
keratin
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What happens immediately after an action potential reaches the presynaptic membrane at a chemical synapse?
A) A calcium influx triggers the release of neurotransmitters. B) Neurotransmitters binds to receptors on the postsynaptic neuron. C) Sodium rushes into the postsynaptic neuron. D) Sodium rushes out of the presynaptic neuron.
Which cell type sends electrical signals?
A. Microglia B. Neurons and microglia C. Neuroglial cell D. Neuron
The chemoreceptor reflexes help maintain homeostasis
A. under normal conditions. B. when epinephrine levels increase. C. when H+ concentrations decrease. D. when stimulated by changes in blood osmotic pressure. E. when CO2 levels increase.
Which of the following is associated with veins but not arteries?
A. Continuous endothelium B. A tunica media with abundant elastic fibers C. Valves D. Fenestrations E. A tunica media with abundant smooth muscle