Physiology 1021 Chapter Notes -Pressure Gradient, Polar 3, Nucleolus

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Centrioles bundles of microtubules that direct movement of dna strands during cell division. Lysosome storage vesicle produced by the golgi apparatus; acts as a digestive system for the cell (contain enzymes to destroy damaged organelles, kill bacteria, and break stuff down) Cell membrane regulates the passage of substances in and out of the cell; also plays an important role in detecting chemical signals from other cells and in forming physical links with adjacent cells. Nucleolus contains specific dna that produces rna in ribosomes; is found in the nucleus. Phosphate head + fatty acid (lipid) tail . Antigens are foreign particles that can stimulate the immune system. Page 4 of 7: diffusion through lipid bilayer fat-soluble molecules only (oxygen, carbon dioxide, fatty acids, and some steroid hormones, diffusion through protein channels water and water-soluble molecules (water, ions) The number of available proteins (once proteins are all occupied, it cannot go faster; saturated) Involves the use of energy (unlike facilitated diffusion)

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