By William Badders, Douglas Carnine, James Feliciani
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Extra resources for Science. Level 5 B (Houghton Mifflin)
Sample text
These actions expand your ch('st, maki ng mo~ space. Air flows in to your body as a result. Caterpillar Insects It t in iI" through holes caUed spiracles. fish brtathe through organs (ailed gills. The opposite process occurs when you exhale. When the chest muscles and diaphrilgm relax, the spo1Ce in the chest decreases. This forces ai r out of yo ur body. All ani mals need oxygen, so all animil ls have some sort of respiratory system. Insects take in air through tiny holes in the exoskeleton called spiracles.
Plant cells, however, often have onc large, central vacuole. When the vacuole in a plant cell is full, the cell is rigid. If the vacuoles in many cells lose water, the plant will wilt. Goigi apparatus The Golgi apparatus receil'es proteins, then processes them for "shipment" outside the cell. This organelle is a system of membranes. It modifies and refines proteins, sometimes adding compounds that will protect them from being broken apa rt. D COMPARE ANDCONTRlST Describe diffe rences between plant ce ll s and ani mal cells.
Movement Some single-<:elled organisms are able to move from place to place, much like anim .. ls do. Movement enables an organism to find food and shelter, or to escape preda tors. The amoeba moves by pushing its membrane forward. " The paramecium moves by using cilia. The cilia beat back and forth like oars on a boat. Another single-<:elled organism, the euglena, has a long structure that acts like a whip. The structure is c.. l1ed a flagell um. It spins like the propeller of a boat. ~ DRAW (ONClUSIONS ~nd p~r~meciil Why do am oe b~ ~ need moving part~?