Why do neurons generate an action potential, instead of simply relying on the opening of ion channels near the stimulus site to transmit information?
What will be an ideal response?
Because, without the action potential, changes in Vm at the stimulus site might not reach the axon terminal
You might also like to view...
In suggesting alternative hypotheses to explain figure 18.18, your lab partner states that perhaps mosses didn't evolve until recently, which is why they increase after herbs and shrubs. Which of the following would be the best response to your lab partner?
a. Mosses were actually the first land plants to appear b. Mosses are better adapted to dry climates c. All land plants appeared at roughly the same time d. If you look carefully at the graph, there were a few mosses present 300,000 years ago, so they probably arose then e. Mammoths probably ate the mosses, so they did not appear until after the mammoths went extinct
Birds and insects both have wings, but we do not consider this similarity as evidence of relatedness because
A. they did not evolve in the same region or live at the same time period. B. the wings are not homologous structures with a common ancestral origin. C. bird wings, but not insect wings, function on the physics principles of lift. D. there is no fossil link between these groups. E. insect wings are vestigial.
The role of cilia on cells is to anchor cells by attaching them to other cells
Indicate whether the statement is true or false
Hemophilia is a recessive X-linked genetic disease. A father who has hemophilia will give the defective allele to ___________
a) all of his daughters and none of his sons. b) none of his daughters and all of his sons. c) 1/2 of his daughters and none of his sons. d) all of his daughters and 1/2 of his sons.