An organelle is
A. a small structure within a cell.
B. a group of organs with a common set of functions.
C. a structure composed of several tissue types.
D. the basic structural unit of all living organisms.
E. a group of cells with similar structure and function.
Answer: A
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Which of the following is not true of keratin?
a. It prevents excessive fluid loss. b. It fills cells of the stratum corneum. c. It helps prevent ultraviolet rays from penetrating the interior of the body. d. All of the above are true of keratin.
Answer the following statements true (T) or false (F)
1. The single most important blood buffer system is the bicarbonate buffer system. 2. One of the most powerful and plentiful sources of buffers is the protein buffer system. 3. As ventilation increases and more carbon dioxide is removed from the blood, the hydrogen ion concentration of the blood decreases. 4. Regulation of the acid-base system is accomplished mainly through respiratory control, and the kidneys also play a small role. 5. Severe damage to the respiratory system rarely will result in acid-base imbalances.
Blood is pumped to the body during this part of the cardiac cycle
A) Atrial diastole B) Ventricular systole C) Ventricular diastole D) Atrial systole
When the concentration of water in body fluids increases, the secretion of ADH
increases. Indicate whether the statement is true or false