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4.4 Removing materia
4.4 Removing material 7th grade
| Term | Definition |
|---|---|
| Selectively permeable | some substances can cross the membrane while others can't |
| Cell membrane | thin flexible barrier that surrounds a cell and controls which substances pass into and out of a cell. made from phospholipid by layer, keeps harmful materials from entering the cell |
| homeostasis | maintenance of stable internal conditions so that the organism can stay alive |
| passive transport | moving materials across the cell membrane without using any energy, can be diffusion and concentration gradient, or facilitated diffusion |
| diffusion | is when molecules move from an area of higher concentration to an area of lower concentration type of passive transport |
| osmosis | diffusion of water molecules across a selectively permeable membrane , passive transport |
| facilitated diffusion | sugar can't move across the cell membrane without a channel through the membrane, uses no cell energy and is a form of passive transport but with the protein channel |
| active transport | molecules move material from lower concentration to higher, This will be used for calcium, potassium, and sodium and the use of cellular energy, |
| endocytosis | cell particles into the cell by changing shape and engulf membrane taking the particles into the cell |
| exocytosis | cell particles go out of the cell by fussing the vacuole to the cell membrane and forces contents out of the cell is active transport |
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