RMP and Graded P O esign Layout References Mailings Review View Help Tell me wha
ID: 3516021 • Letter: R
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RMP and Graded P O esign Layout References Mailings Review View Help Tell me what you want to do The following is a fil-in-the blank exercise to help you review some of the concepts in this section of the chapter. In some cases, you are to fill in the word. In others, you have a choice of terms, in which case you should underline or change the color of the font of the term(s) you are selecting as the correct term. Download the worksheet to your computer so that you may type in answers as you proceed. Excitable cells are capable of changing their RMP to produce two general types of membrane potentials: Graded potentials and Action potentials. These potentials develop because of the presence of channels in the membrane, These channels provide the main path for the flow of current across the membrane because the phospholipid bilayer normally (permit, restricts) the passage of ions. There are two kinds of ion channels: 1. (gated, leakage) channels that are always open and 2. (gated, leakage) channels that require a stimulus to open and close themr At rest, the cel membrane is more permeable to (K+, Nat). This ion is found in higher concentrations (inside, outside) the cell and thus tends to diffuse (out, in). This fact, plus the fact that large negative charges such as those on proteins cannot exit the neuron and are trapped inside work to make the inside of the cell membrane slightly more (positive, negative) compared to the outside. In a resting neuron this charge difference is approximatelymVExplanation / Answer
Answer
Excitable cells are capable of changing their RMP to produce two general types of membrane potentials: graded potential and action potential. These potentials develop because of the presence of voltage-gated channels in the membrane. These channels provide the main path for the flow of current across the membrane because the phospholipid bilayer normally Restrict the passage of ions.
There are two kinds of ion channels: 1. Leakage channels that are always open and 2. Gated channels that require a stimulus to open and close them. At rest, the cell membrane is more permeable K+ . this ion is found in higher concentrations inside the cell and thus tends to diffusion out. This fact, plus the fact that large negative charges such as those on proteins cannot exit the neuron and are trapped inside work to make the inside of the cell membrane slightly more negative compared to the outside. In a resting neuron, this difference is approximately is
-70mV.
The graded potential is so named because they vary in amplitude based on the strength of the Stimulus. The size of the graded potential varies with the number of gated channels open or close as well as the amount of time they remain open. If the flow of ions during a graded potential make the inside of the membrane more positive(such as a change from -70 to -60mV), the membrane is said to be Depolarised. If, on the other hand, the membrane potential becomes more negative (such as from -70 to-80), the membrane is said to be Hyperpolarised. This second type of potential will make it more difficult to produce an action potential. Graded potentials most frequently occur on dendrites or cell body and travel the short distance before fading.
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