In the first phase of triggering an action potential in a neuron, Na+ ions flow in and
A) trigger a positive feedback loop and activate the sodium/potassium pump.
B) only trigger a negative feedback loop.
C) only trigger a positive feedback loop.
D) trigger a negative feedback loop and activate the sodium/potassium pump.
E) only activate the sodium/potassium pump.
C) only trigger a positive feedback loop.
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Macrophages that migrate to the epidermis to guard against pathogens are known as __________ cells.
Fill in the blank(s) with the appropriate word(s).
Many lipid-soluble medications can be delivered by diffusion across the skin. This process is called transdermal administration and is commonly done by applying patches that contain the medication to the surface of the skin. These patches can be attached anywhere on the skin except the palms of the hands and the soles of the feet. Why?
The type of epithelium with multiple cell shapes where the distance between cell nuclei and the exposed surface varies is
A) pseudostratified columnar epithelium. B) simple columnar epithelium. C) simple cuboidal epithelium. D) stratified columnar epithelium. E) stratified cuboidal epithelium.
A broad sheet of dense connective tissue that attaches the coverings of adjacent
muscles is called an ______. Fill in the blank(s) with correct word