Several factors influence the diffusion rate of substances across plasma membrane. A decrease in ___ will increase the rate of diffusion of a substance across a plasma membrane. Temp Steepness of concentration gradient The mass of the diffusing substance  The membrane surface area available for diffusion which one is correct?

How is transport across the cell membrane controlled? Diffusion Concentration gradient Permeability What can and can not diffuse through plasma membrane? Factors affecting diffusion: concentration gradient, temperature, molecule size, surface area

2. Circle the correct bolded blue word. a. A substance that moves across a membrane "down" or "with" their concentration gradient is moving from the side with a higher / lower concentration of that substance to the side with a higher / lower concentration. This does / doesn't require energy input and is called active / passive transport. b. A substance moving "against" or "up" its concentration gradient is moving from the side with a higher / lower concentration of that substance to the side with a higher / lower concentration. This does / doesn't require energy input and is called active / passive transport. c. If the energy from the hydrolysis of ATP is directly used to pump the substance, the transport is called primary /secondary active transport. d. Ion-coupled transport is primary /secondary active transport and has two parts. First, the hydrolysis of ATP is used to power the creation of an ion concentration gradient. The ion is typically Na* or H*. Second, the energy stored in…

Water could moves across plasma member through simple diffusion or facilitated diffusion, energy is not required True False

All are factors of diffusion that play a role in the rate that it moves. substance concentration polarity size pressure heat solubility

1 O2 influx _1 Ca2+ influx 3 K+ influx 2 Na+ efflux 1. simple diffusion _1. Na+ influx by itself 2. facilitated diffusion 1 CO2 efflux 3. primary active transport 2 glucose influx by itself 4. secondary active transport 6 steroid influx or efflux 5. endocytosis 3 Ca2+ efflux that consumes ATP 6. eхосytosis 6 efflux of extracellular proteins 4 Na+ influx that occurs with other substances 2 K+ efflux