EPSP and IPSP potentials are local currents of ions that move along the plasma membrane toward the initial segment area of the . Graded potentials are added together in the initial segment; this process is called . The initial segment, by adding postsynaptic potentials, determines if a(n) potential is reached. This potential is mV. This is a change of mV from the RMP. When this threshold is reached, it initiates the opening of channels and the generation of a(n) potential that will travel along the axon.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

the tricuspid valve is present between right atrium and right ventricle

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.