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Name: 8th grade review 1. Why do cells of unicellular organisms divide? To reproduce. 2. Why do cells of multicellular organisms divide? To grow or make more cells. 3. What does specialization of cells mean? They make systems more efficient or better. 4. Why do cells need to be specialized? To do different types of jobs. 5. Cells work together to form ___Tissues (examples: muscle tissue, connective tissue, nervous tissue, blood.) 6. ____Tissue’s____________ work together to form organs.(heart, lungs, stomach, brain) 7. Organs work together to form ____Organ systems (endocrine, circulatory, integumentary, muscle, skeletal) 8. _____Organ systems________________ work together to form organisms. List the organization of living things from GREATEST to SMALLEST 10. Organisms 11.Organ system 12.Organ 13.Tissue 14.Cell 15. What does the digestive system do? Breaks down food into nutrients. Nutrients are absorbed and waste removed. 16. What does the circulatory (cardiovascular) system do? Pumps blood which carries nutrients and gases throughout your body. Xylem and Phloem in plants act as the circulatory system in plants. 17. What does the endocrine system do? Chemical messages that control hormones. 18. What does the nervous system do? Electrical messages to control body systems. 19. What does the respiratory system do? Animals: Uses oxygen and carbon dioxide for the body. Plants: Photosynthesis 20. What does the excretory system do? Removes waste from blood and regulates body fluids. (organ: Bladder) 21. What does the reproductive system do? Animals: Produces offspring. (Male and Female Plants = Flowers are the reproductive system. Male and Female parts 22. What does the muscle system do? Helps you move. 23. What does the skeletal system do? Support body and protects organs. 24. What does the integumentary system do? Protects tissue beneath them and prevents water loss. Skin, hair and nails. 25. What does the lymphatic system do? Fights bacteria and viruses in your body. 26. Is blood an organ or a tissue? Blood is a tissue—different types of blood cells work together. 27. What does structure have to do with function? The structure is the arrangement of parts and function is what those parts do. The structure is location and function is job. 28. What is the Xylem? In plants, conducts water and nutrients. Also provides a bit of support. 29. What is the phloem? Tube that conducts food through vascular parts. 30. What is the function of the roots? To absorb water and nutrients from the soil. 31. What is the function of the stem? To provide support and some storage. 32. What do leaves do for the plant? Most photosynthesis occurs in leaves. 33. What organ system in a human is like the flower of the plant? Reproductive system 34. What organ system in a human is like the stem of a plant? Skeletal system 35. What organ system in a human is like the xylem and phloem of a plant? Circulatory (cardiovascular)