Across
- 4. A large vein carrying deoxygenated blood into the heart from the head, arms, and upper body
- 5. A theory that cells are the basic structural, functional, and organizational units of both single-celled and multicellular organisms; cells divide and pass on hereditary information; and energy flows within cells.
- 8. Small colorless disk-shaped cell fragments without a nucleus, found in large numbers in blood and involved in clotting.
- 11. The two upper cavities of the heart from which blood is passed to the ventricles.
- 13. A blood vessel that carries blood away from the heart.
- 14. Blood protein produced in response to and counteracting a specific antigen.
- 15. The plant-cell structure the protects and supports the plant cell.
- 16. The main artery of the body, supplying oxygenated blood to the circulatory system. In humans it passes over the heart from the left ventricle and runs down in front of the backbone.
- 18. Watery liquid secreted into the mouth by glands, providing lubrication for chewing and swallowing, and aiding digestion.
- 19. Allowing certain substances to enter or leave but not others.
- 21. A vein carrying oxygenated blood from the lungs to the left atrium of the heart.
- 23. The diffusion of water through a selectively permeable membrane.
- 24. Short microscopic hairlike vibrating structure found in large numbers on the surface of certain cells.
- 25. Drops of clear salty liquid secreted from glands in a person's eye when they cry or when the eye is irritated.
- 26. The fluid area of the cell in which nutrients are absorbed, transported, and processed, and wastes are stored until proper disposal can be carried out.
- 28. The cell structure in plant and animal cells that acts as the control centre and directs all of the cell’s activities.
- 29. The colorless fluid part of blood in which corpuscles or fat globules are suspended.
- 32. A partition separating two chambers of the heart.
- 33. A combination of interacting or interdependent parts that form a unified whole.
- 34. Large structures composed of several different types of tissues that are specialized to carry out a function
- 36. A membranous fold in a hollow organ or tubular structure that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
- 37. A thin, clear, virtually colorless acidic fluid secreted by the stomach glands and active in promoting digestion.
- 38. The plant-cell structure containing many molecules of a green pigment called chlorophyll that helps plants to make their own food.
Down
- 1. The two lower chambers of the heart, left and right.
- 2. Cell organelles that provide the cells with energy through a process called respiration.
- 3. A red blood cell that transports oxygen and carbon dioxide to and from the tissues.
- 6. A large vein carrying deoxygenated blood into the heart from the lower body.
- 7. An organism that is composed of many cells
- 9. A fluid-filled space in plants and animal cells that can store food and water.
- 10. The cell structure in plant and animal cells that covers the entire cell and acts as a gatekeeper, controlling the movement of materials into and out of the cell.
- 12. A colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease.
- 17. The movement of molecules from an area of high concentration to an area of lower concentration.
- 20. An organism that has only one cell
- 22. The artery carrying blood from the right ventricle of the heart to the lungs for oxygenation.
- 27. Any of the fine branching blood vessels that form a network between the arterioles and venules.
- 30. The thin layer of tissue forming the natural outer covering of the body of a person or animal.
- 31. A blood vessel that carries blood toward the heart.
- 35. The protective yellow waxy substance secreted in the passage of the outer ear.