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28 Cards in this Set
- Front
- Back
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what three regions do all cells have? |
•Nucleus •cytoplasm •plasma membrane |
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name the three regions on the nucleus |
•Nuclear Envelope •nucleolus •chromatin |
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what is chromatin composed of? |
DNA and protein |
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describe microvilli |
finger-like projections that increase surface area for absorption |
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what are the membrane junction types |
tight junctions desmosomes gap junctions |
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tight junctions |
impermeable junctions. bind cells together into leak proof sheets |
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desmosomes |
anchoring junctions that prevent cells from being pulled apart |
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gap junctions |
allow communication between cells |
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fibroblasts and erythrocytes |
cells that connect body parts |
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epithelial cells |
cells that cover and line body organs |
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skeletal muscles |
cells that move organs and body parts |
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macrophage |
cells that fight diseases |
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nerve cells |
cells that gather information and control body functions |
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2 basic methods of membrane transport |
passive- no energy active-must produce atp |
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solution |
homogenous mixture of two or more components |
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solvent (ex water) |
dissolving medium; typically water in the body |
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solutes (ex koolaid) |
components in smaller quantities within a solution |
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intracellular fluid |
nucleoplasm and cystol |
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interstitial fluid |
fluid on the exterior of the cell |
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what is selective permeability? |
the plasma membrane allows some materials to pass while excluding others |
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what are the different types of diffusion? |
simple diffusion osmosis facilitated diffusion filtration |
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what type of transport is diffusion? |
passive |
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why may some substances not be able to pass by diffusion? |
•may be too large •may not be able to dissolve •may have to move against a concentration gradient |
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2 common forms of active transport |
exocytosis endocytosis |
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describe exocytosis |
moves out of the cell |
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endocytosis |
moves outside of the cell |
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types of endocytosis |
phagocytosis- eating pinocytosis- drinking |
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cells do what? |
carry out all chemical activities needed to sustain life |
