A sensitized B cell typically is not activated until
A) it binds a helper T cell that releases cytokines.
B) it binds a cytotoxic T cell.
C) memory B cells have been cloned.
D) it has cloned plasma cells.
E) antibodies have been produced.
A
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During the flight or fight response, sympathetic pathways cause arterioles to contract. If this is true, how is it possible to increase blood flow to areas that require additional oxygen, such as skeletal muscle?
What will be an ideal response?
Which of the following is not a function of membrane proteins?
a. Transport of polar molecules b. Transport of H+ into the cell c. Binding sites for vesicles d. Cell recognition e. Passageway for water molecules
Which of these arteries might a red blood cell encounter if it started in the left ventricle and went to the brain?
A. radial artery B. brachiocephalic artery C. external carotid artery D. axillary artery E. Both radial artery and brachiocephalic artery would be encountered.
Pinocytosis is a specific type of exocytosis.
Answer the following statement true (T) or false (F)