Crossword13

1. _____ Cells Differentiated B cells that secrete large quantities of antibodies during an immune response.
4. A protective secretion of the digestive and respiratory systems that traps pathogens and particles.
7. A subtype of T cells that kill infected cells by inducing apoptosis.
9. A network of capillaries in the nephron where filtration of blood occurs.
10. A subtype of T cells that activate B cells, cytotoxic T cells, and other immune cells by secreting cytokines.
14. Channel proteins in cell membranes that facilitate the rapid movement of water.
16. A protein in red blood cells that binds oxygen in the lungs and releases it in tissues.
18. The specific part of an antigen that binds to an antibody or antigen receptor.
19. Y-shaped proteins secreted by plasma cells that specifically bind to antigens to neutralize or eliminate them.
20. A hormone secreted by the stomach that stimulates hunger before meals.
22. The process of introducing antigens into the body to stimulate the production of memory cells and immunity.
23. _______ Immunity A specific immune response enhanced by previous exposure to pathogens, involving B and T cells.

2. Tiny air sacs in the lungs where gas exchange occurs between air and blood.
3. The process of maintaining water and solute balance in the body to ensure homeostasis.
5. _____ Cells Long-lived B or T cells that provide immunity by responding more rapidly and effectively to subsequent exposures to the same antigen.
6. An inactive enzyme secreted by chief cells in the stomach, converted to pepsin in the presence of hydrochloric acid.
8. An organism or agent that causes disease, such as bacteria, viruses, or fungi.
11. Expansion The rapid multiplication of B or T cells in response to an antigen, generating a large population of immune cells specific to that antigen.
12. _______ Immunity The non-specific first line of defense against pathogens, involving barriers, phagocytes, and inflammation.
13. Finger-like projections in the small intestine that increase surface area for nutrient absorption.
15. ________ Node (SA Node) A group of autorhythmic cells in the heart that act as the pacemaker, initiating the cardiac cycle.
17. A hormone secreted by fat cells that suppresses appetite and regulates energy balance.
21. A molecule or substance that elicits an immune response by being recognized by antigen receptors on B and T cells.