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Grade 5 A-1 Sci. Def
From Single Cells to Body Systems
| Term | Definition |
|---|---|
| cell | The basic unit of structure and function of all living things |
| cell membrane | The thin covering that encloses a cell and holds its parts together |
| nucleus (cell) | The organelle that controls all of a cell's activities |
| cytoplasm | A jellylike substance containing many chemicals that keep a cell functioning |
| diffusion | The process by which many materials move in and out of cells |
| osmosis | The diffusion of water and dissolved materials through cell membranes |
| tissue | Cells that work together to perform a specific function |
| organ | Tissues that work together to perform a specific function |
| system | Organs that work together to perform a function |
| capillaries | The smallest blood vessels |
| alveoli | Tiny air sacs located at the ends of bronchi in the lungs |
| villi | The tiny tubes sticking into the small intestine |
| nephrons | One of the tubes inside the kidneys where urea and water diffuse from the blood |
| bone marrow | A connective tissue that produces red and white blood cells |
| joints | A place where bones meet and are attached to each other and to muscles |
| tendons | Tough bands of connective tissue that attach muscles to bones |
| ligaments | One of the bands of connective tissue that hold a skeleton together |
| neuron | A specialized cell that can receive information and transmit it to other cells |
| receptors | Nerve cells that detect conditions in the body's environment |
Created by:
scscolts
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