Fine hairs covering the general surface of the body are
A) intermediate hairs.
B) terminal hairs.
C) heavily pigmented hairs.
D) vellus hairs.
E) None of the answers are correct.
D) vellus hairs.
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What is the most common transport mechanism by which glucose and other organic solutes cross the luminal membrane of an epithelial cell layer?
A. Simple diffusion through the paracellular pathway B. Secondary active cotransport with Na+ C. Glucose ATPase pump D. Through an ion channel E. Facilitated diffusion
A person with an endocrine disorder wants to know the difference between a hormone and a neurotransmitter. What should be explained to this person?
A. Hormones are released at synapses. B. Neurotransmitters affect a single cell, whereas hormones affect multiple cells. C. Hormones affect the target tissue immediately and very briefly. D. Neurotransmitters are released into the bloodstream.
In the olfactory epithelium, ______ cells act as stem cells to continually replace olfactory neurons
Fill in the blank with correct word.
The ________ contains lobules with sinusoids (lined with macrophages) that lead to a central venous structure.
A) liver B) spleen C) pancreas D) stomach