In a graded potential the direction of current flow is designated by the movement of positive charges
Indicate whether the statement is true or false
T
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In clonal selection of B cells, which substance is responsible for determining which cells will eventually become cloned?
A) antigen B) interferon C) complement D) antibody
A woman seeking to become pregnant could do which of the following to measure when she might be ovulating?
a. count the number of days that have passed since the onset of her last menses b. record her basal body temperature c. look for a thinning in the cervical mucus d. all of the above
The hormone calcitonin
A) stimulates osteoclast activity. B) decreases the rate of calcium excretion. C) decreases the rate of calcium absorption. D) decreases the level of calcium ion in the blood. E) stimulates osteoblasts and inhibits osteoclasts.
Where does the majority of nutrient absorption occur?
A. the stomach and duodenum B. the duodenum and ileum C. the jejunum and duodenum D. the ileum and jejunum