Simple diffusion and facilitated diffusion differ in that facilitated diffusion requires assistance of a membrane protein to move substances across a membrane.
a. true
b. false
Answer: a. true
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When the level of potassium ions in the ECF increases,
A) osmoreceptors swell. B) ions are conserved. C) less ADH is released. D) there is an increase in the level of aldosterone. E) there is a decrease in the level of atrial natriuretic peptide.
Which of the following is not true of the anatomy of the stomach?
A. The muscularis contains three layers, whereas most tubular digestive organs contain two. B. The pyloric sphincter regulates the flow of chyme from the stomach into the duodenum. C. The cardia is the region that lies superior to the opening of the esophagus into the stomach. D. The greater curvature is on the lateral and inferior surfaces of the stomach. E. All of these are true of the stomach.
H2O is an example of a(n)
A) ionic formula. B) glucose molecule. C) molecular formula. D) covalent formula.
Regulatory T cells act to
A) inhibit T and B cell activities. B) erase memory T cells. C) limit antigen proliferation. D) suppress antigens. E) produce antibodies involved in autoimmunity.