________ transport is required to move a substance across a membrane against a concentration gradient.
Fill in the blank(s) with the appropriate word(s).
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How can potentially poisonous gases like NO and CO be used by the body?
What will be an ideal response?
Hormones released into the interstitial fluid by the anterior pituitary enter the circulation easily because
A) they are brought through the choroid plexus by active transport. B) they pass easily through the infundibulum. C) a strong countercurrent mechanism maintains a concentration gradient that draws them in. D) the adjacent capillaries are fenestrated to permit passage of large molecules into the circulation. E) None of the answers are correct.
____ T cells are necessary for cloning of other immune cells?
a. cytotoxic. b. helper. c. suppressor. d. regulatory. e. inhibitory.
Which type of cartilage is found in the intervertebral discs?
A. Articular cartilage B. Fibrocartilage C. Elastic cartilage D. Reticular cartilage E. Hyaline cartilage