How is epithelial tissue the opposite of connective tissue?
What will be an ideal response?
In epithelial tissue the cells are packed together very tightly. Epithelial tissue is avascular. Epithelial tissue has three cell types that cover or line things and make tubes. Epithelial tissue has no fibers and it tends to be polar. Connective tissue has cells spaced far apart and is highly vascular (except cartilage). The cells of connective tissue vary greatly in shape and size. Connective tissue glues other tissues together and has three fiber types. Connective tissue tends to be nonpolar. Connective tissue has a large amount of ground substance; epithelial tissue does not.
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The thyroid gland is visualized easily on CT sectional images of the neck because
A. it is adjacent to the internal jugular vein, so it absorbs contrast that is administered intravenously. B. it is adjacent to the common carotid artery, so it absorbs contrast that is administered intravenously. C. its density is similar to cartilage. D. it naturally contains iodine.
When shoveling snow from the driveway, the older man did not feel the bitter cold. Which action made his blood vessels get smaller in diameter, conserving heat in the warm core of his body?
A) Vasomotor B) Vasopressor C) Vasoconstriction D) Vasodilation
Tubular secretion
a. refers to the movement of a substance from the peritubular capillary blood into the tubular lumen b. can occur by active or passive transport mechanisms c. of K+ occurs in the distal and collecting tubules and is stimulated by aldosterone d. of organic ions occurs in the proximal tubule by two distinct types of carriers e. has all of the above characteristics
The type of feedback that increases or enhances the effects of the variable is:
A) negative. B) responsive. C) positive. D) neutral.