In Ménière's disease, an ednolymphatic hydrops (EH) in scala media leads to a distention and, eventually, rupture of Reissner's membrane. This results in an influx of K+-rich endolymph into the Na+-rich perilymph of scala vestibuli.

2021年1月25日 · As you rightfully say, this pressure difference is established across Reissner's membrane and across the BM (Fig. 3). It is the movement of the BM that ultimately results in the sensation of sound (source: Ento Key). In fact, the movement of Reissner's membrane is comparable to that of the BM (Reichenbach et al., 2012). However, Reissner's ...

2016年6月10日 · The existence of membrane potential is just that: as long as they are alive, cells try to keep their cytosol different from the outside soup, mainly by expelling sodium ions. There is a longer story, with cells pumping other ions in or out, or leaking ions due to the imbalance, but resting membrane potential really revolves around sodium. There ...

2016年4月17日 · See this paragraph and image from The Cell: A Molecular Approach. 2nd edition.. During passive diffusion, a molecule simply dissolves in the phospholipid bilayer, diffuses across it, and then dissolves in the aqueous solution at the other side of the membrane...Passive diffusion is thus a nonselective process by which any molecule able to dissolve in the …

Background: The neuron's membrane resting potential is maintained at a certain voltage. The neuron has a lipid bilayer with certain protein channels which allow the movement of ions in both directions (in and out). Some of these protein channels are gated by: 1) mechanical changes (stretching, pressure, etc)

Lipid rafts are membrane regions which are composed of rigid lipids like cholesterol and sphingolipids. Lipid rafts are thicker than regular membrane and do not diffuse into the latter. Some proteins are specifically anchored to/incorporated into the lipid rafts (T-Cell receptor, IgE receptor) and their relative position with adjacent proteins ...

In a cellular sense, increased capacitance requires a greater ion concentration difference across the membrane. What myelin does is insulating the neuron, thereby decreasing its capacitance. You could say that by increasing the thickness of the membrane, the negative insides of the cell do not attract positive charge outside the cell.

2017年9月12日 · Cholesterol certainly affects plasma membrane fluidity. In 1978 Cooper found that increasing the ratio of cholesterol to phospholipids decreased the membrane fluidity. This also reduces membrane permeability and reduces the survival of the cells (red blood cells in that case). I imagine this is where the textbooks draw their conclusions.

2024年5月24日 · One more thing to note is that answer will be based on this statement from textbook which itself is vague- "Like mitochondria, the chloroplasts are also double membrane bound. Of the two, the inner chloroplast membrane is relatively less permeable." Plz answer me based on facts and also based on the statement I have copy pasted from textbook.

Choose the correct statement/s: (A) The resting membrane potential of -70 mV would not change with either GABA or glutamate treatments. (B) The membrane potential would be even more negative than resting phase with GABA treatment. (C) The membrane potential would be positive when the neuron was exposed to glutamate.