Capillary walls consist only of

A. a single layer of epithelial cells covered by connective tissue.

B. connective tissue.

C. a single layer of endothelial cells.

D. smooth muscle.

E. a single layer of epithelial cells covered by smooth muscle.


C. a single layer of endothelial cells.

Biology & Microbiology

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Calcium ion concentrations are tightly regulated because of the importance of calcium in biological functions

Calcium ion concentrations are ____ inside the cell than out.

a. slightly higher b. slightly lower c. the same d. much higher e. much lower

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The number of new cases of a disease in a population over a specific period of time compared with the healthy population is the ________.

A. epidemic rate B. mortality rate C. incidence rate D. morbidity rate E. prevalence rate

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Marine cartilaginous fishes overcome water loss to their environments by:

a. having specialized chloride cells in their gills that prevent water loss. b. having specialized chloride cells in their gills that continuously excrete salts. c. storing urea in their body fluids, which causes them to be hypertonic to seawater. d. producing very small quantities of urine. e. drinking large quantities of freshwater

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Most often, the largest gradient in water potential is between

A. xylem and phloem. B. leaf cells and the intracellular spaces inside the leaves. C. the relative humidity inside the leaf and the relative humidity outside the plant. D. roots and soil water. E. root xylem and shoot xylem.

Biology & Microbiology