Which of the following nonmembranous organelles increases surface area?
A) flagellum
B) cilia
C) microvilli
D) microtubules
C
Explanation:
A) A flagella is used for locomotion.
B) Cilia are a nonmembranous organelles that extend from the cell membrane.
D) Microtubules are made up of the protein tubulin and are used for structure and support.
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Systemic physiology is
A) the study of the effects of diseases on system functions. B) the study of the function of specific organs. C) the study of the functional chemistry of cells. D) the study of all aspects of the functioning of specific organs systems. E) the study of functions of the whole human body.
Water reabsorption occurs
a. by osmosis in the proximal tubule b. under the control of vasopressin in the distal and collecting tubules c. by osmosis in the distal and collecting tubules d. under all of the above conditions e. only under conditions b and c
The sodium-potassium pump uses ATP to move sodium and potassium ions across the plasma membrane. This statement describes _____.
A)facilitated diffusion B)secondary active transport C)exocytosis D)simple diffusion E)primary active transport
Which of the following best describes the term "Z line"?
A) protein that accounts for elasticity of resting muscle B) repeating unit of striated myofibrils C) storage site for calcium ions D) where thin filaments are anchored E) largely made of myosin molecules