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bio 243 chapter 3
Terms in this set (21)
The cell "engulfs" a large particle by forming projecting pseudopods around it and enclosing it within a membrane sac called a phagosome. The phagosome is combined with a lysosome. Undigested contents are ejected. What is this called?
The cell "gulps" a drop of extracellular fluid containing solutes into tiny vesicles. No receptors are used, so the process is nonspecific. What is this called?
Extracellular substances bind to specific receptor proteins, enabling the cell to ingest and concentrate specific substances in protein-coated vesicles. Ligands may simply be released inside the cell, or combined with a lysosome to digest contents. Receptors are recycled to the plasma membrane vesicles. What is this called?
Receptor- mediated endocytosis
Tough, insoluble protein fibers constructed like woven ropes composed of fibrous subunits
strands made if spherical protein subunits called actins
hollow tubes of spherical protein subunits called tubulins
In a cilium there are ___ outer microtubule doublets and ____ central microtubules.
movement from high concentration to lower concentration
movement from high pressure to lower pressure
movement of fats, oxygen, and carbon dioxide through the lipid portion of the membrane
movement of water into and out of cells via membrane pores
movement of glucose into cells
movement of water, nutrients, and gases through a capillary wall
movement of amino acids and most ions across the membrane
secretion of neurotransmitters, hormones, mucus, etc.
protective phagocytes (some white blood cells, macrophages)
takes in solutes by absorptive cells of the kidney and intestine
intake of some hormones, cholesterol, iron, and other molecules
retaining normal size
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