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16 Cards in this Set
- Front
- Back
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Describe the placement of Golgi in cells that undergo a) constitutive and b)regulatory secretion
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a) scattered throughout cytoplasm
b) between nucleus and secretory surface |
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What are 3 types of endocytosis?
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Phagocytosis
Pinocytosis Receptor mediated endocytosis |
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Describe phagocytosis
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Cell extends pseudopodia to surround large particle (e.g. bacteria) in a vesicle. Vesicle pinches off membrane
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Describe pinocytosis
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Cell drinking - liquid taken up either via cell barrier or by cell
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Descibe receptor-mediated endocytosis
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Material to be ingested has to bind to receptors on cell membrane
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What is the name of the protein that borders coated pit in RM endocytosis?
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Clathrin
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What is the definition of secretion?
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Movement of materials which are useful for the organism from one compartment to another
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What is the definition of excretion?
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Movement of material from organism to the exterior (waste)
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What 4 categories of secretory products are there?
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Signalling compounds
Other active compounds Protective barrier secretions Extracellular matrix & plasma membrane components |
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What products could be signalling products?
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Hormones, growth factors, transmitters
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What is endocrine signalling?
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Signal influences tissue a distance from origin
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What is paracrine signalling?
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Signal influences other cells local to site of production
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What is autocrine signalling?
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Cell that produces signalling molecule is itself activated by it
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What products could be in active compounds?
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Digestive enzymes, lysozymes, igA, bile
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What are protective barrier secretions?
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e.g. serous, mucous, sebum
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Give examples of ECM and plasma membrane molecules
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Collagen, GAGs
Receptors, anchoring molecules, membrane bound enzymes |
