Lymphocytes don't stay in one lymphatic structure for long, which ensures better chances of meeting their antigen. This process of lymphocytes re-entering the blood and lymph to circulate every few days is called lymphocyte ________.
Fill in the blank(s) with the appropriate word(s).
recirculation
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Comparing two cups of coffee, one with no sugar added and the other has had a packet of sugar dissolved in it, we can say that the coffee with sugar is more concentrated.
Answer the following statement true (T) or false (F)
The glial cell that protects neuron cell bodies located within ganglia is the
A. satellite cell. B. ependymal cell. C. neurolemmocyte. D. astrocyte. E. oligodendrocyte.
The pharynx is lined with a keratinized epithelium to protect against abrasion.
Answer the following statement true (T) or false (F)
All of the following statements concerning the esophagus are correct EXCEPT
(A) It extends from the pharynx to the stomach. (B) It is crossed by the arch of the aorta. (C) It is crossed by the right main bronchus. (D) It passes through the esophageal hiatus. (E) It normally has four constrictions.