(electrical impulse): a change in membrane potential that
generating a signal.
channels to
a. An adequate stimulus acts on a neuron can trigger the ligand-gated
open, allowing Nat to diffuse rapidly into the cell, producing a local depolarization.
b. When
potential is reached, the mechanically -gated
channels open and more Nations enter the cell, causing further
C. This state is an all-or-none response. And it is an example of positive feedback mechanism.
d. The above channels just stay open for only about 1ms and then automatically close.
e. After action potential peaks, membrane begins to move back toward the resting membrane
channels open, allowing
potential due to the activation of
_-gated
outward diffusion of K+ : process is known as repolarization,

Where does all the water go? according to the environmental protection agency (epa), in a typical wetland environment, 39% of the water is outflow; 46% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem (reference: united states environmental protection agency case studies report 832-r-93-005). chloride compounds as residuals from residential areas are a problem for wetlands. suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 60.4; seepage, 73.7; remaining due to evaporation, 26.4; in the water volume, 46.8. (a) compute the weighted average of chlorine compound concentration (mg/l) for this ecological system. (round your answer to one decimal place.) mg/l (b) suppose the epa has established an average chlorine compound concentration target of no more than 58 mg/l. does this wetlands system meet the target standard for chlorine compound concentration? yes. the average chlorine compound concentration (mg/l) is too high. yes. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is too high.