One function of epithelial cells is to form selective barriers regulating exchange of materials across them
Indicate whether the statement is true or false.
TRUE
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The natural dietary sources for vitamin B12 (cobalamin) are
A) fruits only. B) meats and milk. C) vegetables only. D) breads and potatoes. E) leafy vegetables.
Internal work includes
a. all of the energy-expending activities that must go on all of the time to sustain life b. all energy expenditure by tissues other than skeletal muscles c. the energy expenditure required to move external objects d. both a and b e. all of the above
When there is a lack of vitamin D in a child's diet, a condition called ________ may develop.
Fill in the blank(s) with the appropriate word(s).
Each of the following is a function of smooth endoplasmic reticulum except
A) storage and release of calcium ions. B) synthesis of protein. C) synthesis of steroid hormones. D) synthesis of triglycerides. E) detoxification of drugs.