Which of the following describes the fluid mosaic model of the plasma membrane structure?
A) The plasma membrane is composed of two layers of proteins embedded with lipids.
B) The lipid bilayer is solid at body temperature, thus protecting the cell.
C) The phospholipid bilayer is embedded with associated proteins, cholesterol and sugars and has a dynamic arrangement.
D) Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains.
Answer: C
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One of the functions of blood is to regulate fluid levels in the body. If too much fluid escapes from the bloodstream and enters the tissues, blood pressure will
A. decrease. B. increase.
Normal aging causes many effects on the body, including
A) epithelia become thinner. B) repair and maintenance activities become less efficient. C) connective tissue becomes more fragile. D) hormone and lifestyle alterations affect the structure and chemical composition of many tissues. E) All of the answers are correct.
The distribution of sodium and potassium ions between intracellular and extracellular compartments is
A. potassium mainly intracellular; sodium mainly in extracellular. B. sodium mainly intracellular; potassium mainly in extracellular. C. little of either intracellular but large amounts of both extracellular. D. equal amounts of both ions, in both intracellular and extracellular fluids. E. None of these choices is correct.
Calcitonin
A. stimulates bone resorption (breakdown). B. is synthesized by the skin, liver, and kidneys. C. increases blood calcium. D. stimulates osteoblast activity.