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Sc. 8 Cells & System
plant and animal cells, systems in humans
| Question | Answer |
|---|---|
| What are some common characteristics of living organisms? | Living organisms: -need energy - respond and adapt to their environments - reproduce - grow - produce waste |
| Plants use this from the sun to make their own food. | energy |
| Animals get their energy from what? | food |
| What are the smallest things scientists believe to be alive? | cells |
| What is the process used to break down food so that organisms can use materials from the food for energy? | digestion |
| Most living organisms have systems that perform functions to keep the organism alive.What are these systems called? | organs |
| Organs are made from tissues, what are tissues made from? | cells |
| What system does the heart belong to? | circulatory system |
| What system does the stomach belong to? | digestion system |
| What system do lungs belong to? | respiratory system |
| What does multicellular mean? | it has many cells |
| What does unicellular mean? | it has a single cell |
| Jellylike material in which other parts of the cell float. Distributes materials such as oxygen and food to different parts of teh cell. | cytoplasm |
| surronds and protects the contents of the cell. Helps control the movement of substances in and out of the cell. | cell membrane |
| They are thicker and more rigid then cell membranes. Made from cellulose and provide support for the cell. | cell wall |
| are large,dark,round and are often the most easily seen structure in a cell. It controls most of the cell's activities. | nucleus |
| balloonlike spaces within the cytoplasm are storge places for extra food, wastes and other substances that the cell cannot uses right away. | vacuole |
| are the structures in which the process of photosynthesis takes place. They are found only inside cells in green plants. They are not found in animal cells. | chloroplast |
| structures inside the cell | organelles |
| Why are cells so small? | To do their work, cells need a constant supply of oxygen, water, and food particles and have to get rid of wastes. Larger cells would need more materials and would produce more wastes.Materials can only get in and out through the cell membrane. |
| A membrane that lets all materials cross it. | permeable |
| A membrane that lets nothing cross it. | impermeable |
| the movement of particles in liquids and gases from an area of higher concentration to and area of lower concentration. The spreading out process of molecules. | diffusion |
| transports sugars manufactured in the leaves to the rest of the plant | phloem |
| conducts water and minerals absorbed by the root cells to every cell in the plant | xylem |
| loss of water from a plant through evaporation | transpiration |
| the diffusion of a solvent, usually water, through a selectively permable membrane | osmosis |
| system responsible for moving blood through our bodies | circulatory |
| system responsible for exchanging oxygen and carbon dioxide | respiratory |
| all living things are composed of one or more cells, that the cell is the basic unit of life, and that all cells come from already existing cells | cell theory |
Created by:
clisafeld
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