S for P 0.0 / 5 ? Allchemical level of organisationUniversityAll boards Created by: Ciara SimpsonCreated on: 06-04-19 18:49 what does a negative feedback system do? reverses change in condition (eg. BP) 1 of 37 what is involved in a negative feedback system? baroreceptors - nerve impulses - brain - effectors 2 of 37 how does a positive feedback system work? a change is reinforced until blocked 3 of 37 what is involved in a positive feedback system? stimulus - receptors - effectors 4 of 37 what is maintained in homeostasis? temperature, water and electrolyte balance, glucose levels, oxygen and co2 levels, blood pressure 5 of 37 what is catabolism? converting substances back to their building blocks 6 of 37 what is anabolism? synthesising complex molecules from simple ones 7 of 37 what does ATP do? powers cellular activity 8 of 37 what is differentiation? unspecialised cell to specialised cell 9 of 37 what is endocytosis? movement into a cell in vesicles 10 of 37 what is exocytosis? movement out of a cell in vesicles that fuse with membrane and release their contents 11 of 37 what is active transport? substances cross the membrane moving up the concentration gradient with the use of ATP 12 of 37 Pumps are sodium, calcium and potassium ions use pumps to maintain their concentration gradient 13 of 37 transport vesicles = substances moving with ATP 14 of 37 what is in cytoplasm? the cytosol and the organelles 15 of 37 what is cytosol? intracellular fluid 16 of 37 Lysosomes.. digest foreign bodies, microbes and dead organelles 17 of 37 Cillium.. moves extracellular fluids 18 of 37 Flagella.. moves the cell itself 19 of 37 ribosomes.. free or attached to rough ER, used for protein synthesis 20 of 37 peroxisomes.. vesicles containing oxidative enzymes and catalase 21 of 37 peroxisomes.. deactivate toxic materials eg alcohol 22 of 37 peroxisomes.. oxidise amino acids and fatty acids 23 of 37 a vesicle is a small sac that imports materials from intracellular to extracellular 24 of 37 mitochondria are folded membranes full of enzymes responsible for ATP synthesis and are sites for aerobic respiration 25 of 37 Rough ER has ribosomes 26 of 37 smooth ER doesn't have ribosomes 27 of 37 rough ER synthesises glycoproteins and phospholipids for use by other organelles 28 of 37 smooth ER ynthesises fatty acids and steroids and releases calcium in muscle cells 29 of 37 the golgi complex flattened sacs called cistenae; entry face, medial cistern and exit face 30 of 37 the golgi complex is responsible for protein and lipid synthesis 31 of 37 how many nuclei do skeletal cells have? multiple 32 of 37 how many nuclei do red blood cells have? none 33 of 37 how many nuclei do cells usually have? one 34 of 37 what it the nucleus surrounded by lipid bilayer 35 of 37 what is the outer layer of the nucleus continuous with? rough ER 36 of 37 what does DNA do? directs metabolic activities 37 of 37
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