The plasma membrane of a cell is composed of:
a. phospholipid molecules
b. cholesterol molecules
c. protein molecules
d. all of the above
d. all of the above
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A) Tight junctions B) Gap junctions C) Desmosomes 31) Help prevent molecules from passing through the extracellular space between adjacent cells. 32) Type of anchoring junction. 33) Allows ions and small molecules to pass through from one cell to another. 34) Present in electrically excitable tissues. 35) Abundant in tissues subjected to great mechanical stress.
The number-one way to prevent the spread of disease is _____.?
A) ?bathing daily B) ?keeping the fingernails short C) ?wearing gloves D) ?handwashing
Which of the following is not true of the respiratory pump?
A. Contraction of the diaphragm causes an increase in the volume of the thoracic cavity, and a decrease in pressure. B. It is a mechanism that helps with venous return to the heart. C. More blood enters the heart during expiration than inspiration. D. Increased venous return to the heart causes the heart rate to increase. E. All of these are true of the respiratory pump.
What effect does an increase in antidiuretic hormone (ADH) have on the volume of extracellular fluid (ECF)?
A) ECF increases when antidiuretic hormone (ADH) is present. B) Antidiuretic hormone (ADH) has no effect on ECF. C) ECF increases initially, and then decreases when antidiuretic hormone (ADH) is present. D) ECF decreases when antidiuretic hormone (ADH) is present.