biology

2. The maintenance of a constant internal environment
8. A group of similar cells working together to perform a specific function.
10. The breakdown of large food molecules into small, soluble molecules that can be absorbed into the bloodstream
14. The junction between two neurons
17. any microorganism that causes disease in another organism
18. The control of water potential in the blood and body fluids
19. Plant vascular tissue that transports water and mineral ions up from roots to shoots and leaves
20. The net movement of particles from an area of higher concentration to an area of lower concentration
21. can be multicellular or single-celled and are made up of cells that contain a nucleus with a distinct membrane
22. Tiny air sacs in the lungs where gas exchange occurs

1. The process by which green plants and some other organisms use light energy to convert carbon dioxide and water into glucose and oxygen
3. An organelle containing genetic material that controls the cell's activities
4. Where photosynthesis occurs
5. A chemical messenger released from vesicles at the end of a presynaptic neuron into the synaptic cleft.
6. Where aerobic respiration occurs
7. A specialized structure within a cell that performs a specific function
9. Organelles where protein synthesis occurs.
11. The chemical reactions in cells that break down nutrient molecules to release energy for metabolism
12. A blood vessel that carries blood away from the heart under high pressure.
13. A substance that speeds up a chemical reaction without being changed or used up.
15. A biological catalyst, usually a protein, that speeds up chemical reactions in living organisms without being used up itself
16. A chemical messenger produced by an endocrine gland, secreted into the blood, and carried to target organs where it exerts a specific effect.