The type of glial cell that plays a critical role in the formation of CSF is the ________ cell.
Fill in the blank(s) with the appropriate word(s).
ependymal
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Why does hair turn gray or white as people age?
A. Keratin production decreases. B. Melanocytes die out. C. The shaft becomes rounder in cross-section. D. Mitosis slows down in the hair shaft. E. Blood supply to the scalp diminishes.
Water molecules and small ions enter a cell through
A) channels formed by integral membrane proteins. B) peripheral proteins. C) lipid channels. D) peripheral carbohydrates. E) defects in the lipid layer of the membrane.
These features are common to all connective tissues except
A) Most cells are not in direct contact with each other. B) Interstitial fluid is so scarce that it is not visible with a light microscope. C) Cells usually occupy less space than extracellular material. D) Protein fibers are usually present in the ground substance. E) Most of them are highly vascular.
Inspiration is the time during which ________
A) air passes out of the lungs B) air is taken into the lungs C) air passes from the alveoli into the conducting passageways D) air is taken into the nasal passageways