How does a depolarizing graded potential lead to the propagation of action potentials?
What will be an ideal response?
A depolarizing graded potential does not reverse the polarity of the cell membrane, but it moves the potential closer to threshold voltage. If threshold voltage is reached, voltage-gated Na+ channels in that region will open, causing an action potential in which the inside border of the membrane becomes positive. This reversal in polarity causes the membrane potential in the adjacent region to reach threshold, which causes voltage-gated Na+ channels in that region to open. Thus, an action potential in one region will change the voltage in an adjacent region significantly enough to generate an action potential there. This process continues and allows the action potentials to be propagated along the plasma membrane.
You might also like to view...
During the third week of development, what is the result of gastrulation?
A. It converts the epiblast into a hypoblast. B. It converts the hypoblast into endoderm. C. It forms the primitive streak. D. It forms the neural tube. E. It forms the amniotic cavity.
A joint capsule is reinforced by
A) ligaments binding articular ends of bones together. B) tendons binding articular ends of bones together. C) hyaline cartilage providing strength to the capsule walls. D) articular cartilage cushioning ends of bones.
During inspiration, the expiratory neurons of the ventral respiratory group (VRG) are being inhibited.
Answer the following statement true (T) or false (F)
Metastasis is a group of atypical cells in situ.
Answer the following statement true (T) or false (F)