Arrange the following statements to create the proper order of events in the humoral immune response:
1. The helper T cell interacts with antigen presented in an MHC-II molecule.
2. The B cell divides to produce memory B cells and effector B cells.
3. Antibodies specific for the antigen are produce in large numbers.
4. The helper T cell secretes interleukin-2.
5. The B cell presents antigen fragments specific for its surface antibodies using MHC-II molecules on the cell surface.
1, 3, 2, 5, 4
5, 1, 4, 2, 3
3, 4, 2, 5, 1
4, 2, 5, 1, 3
2, 4, 3, 1, 5

What is a difference between systemic and pulmonary circulation? a. systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body. b. systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. c. systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs. d. systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.