White blood cells engulf bacteria by means of ________.
A. active transport
B. pinocytosis
C. facilitated diffusion
D. exocytosis
E. phagocytosis
Answer: E
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Which of the following is a principle of the fluid mosaic model of cell membrane structure?
A) Phospholipids form a bilayer that is largely impermeable to water-soluble molecules. B) Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains. C) The lipid bilayer is a solid at body temperature, thus protecting the cell. D) All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell.
A long-distance runner is about to enter a 5-mile race. Beforehand, he spends several minutes warming up. During the warm-up period, the phenomenon of treppe is occurring in body muscles being used. What is treppe and why does it occur?
What will be an ideal response?
Atrial natriuretic peptide causes ________ of afferent arterioles and ________ of mesangial cells.
A. constriction; contraction B. dilation; contraction C. constriction; relaxation D. dilation; relaxation
Which of the following is an example of an autocrine regulator?
A) insulin B) prostaglandins C) nitric oxide D) all of the above E) none of the above