What does abluminal mean?
: forming, involving, or occurring on the outer surface of a body part or device with an internal cavity or channel : not adjacent to the lumen of a tubular organ or part … the abluminal surface of the stent …—
What is a membrane potential in medical terms?
: the potential difference between the interior of a cell and the interstitial fluid beyond the membrane — see inhibitory postsynaptic potential.
Is the blood brain barrier a plasma membrane?
Brain capillary endothelial cells form the blood-brain barrier. They are connected by extensive tight junctions, and are polarized into luminal (blood-facing) and abluminal (brain-facing) plasma membrane domains. The polar distribution of transport proteins allows for active regulation of brain extracellular fluid.
What are the membrane potentials of living cells?
Differences in the concentrations of ions on opposite sides of a cellular membrane lead to a voltage called the membrane potential. Typical values of membrane potential are in the range –40 mV to –70 mV.
What happens to the membrane potential if you increase sodium permeability?
If you experimentally increase the permeability of an axonal membrane to sodium ions, the equilibrium potential for sodium in the cell will a. increase, because the influx of sodium depolarizes the neuron. decrease, because the efflux of potassium that follows sodium influx repolarizes the membrane.
Is blood toxic to the brain?
Damage to brain cells Blood can irritate, damage, or destroy nearby brain cells. This may cause problems with body functions or mental skills.
What is the medical definition of the abluminal surface?
: forming, involving, or occurring on the outer surface of a body part or device with an internal cavity or channel : not adjacent to the lumen of a tubular organ or part … the abluminal surface of the stent …— Ron Waksman, The Lancet, 3 Oct. 2008 We have observed that the individual extravasated cells extend pseudopodial projections that wrap
What is the definition of an abluminal wall?
an inner luminal wall surface and an outer abluminal wall surface and defining a central lumen or passageway.
Which is the best definition of the word membrane?
noun Anatomy. a thin, pliable sheet or layer of animal or vegetable tissue, serving to line an organ, connect parts, etc. Cell Biology. the thin, limiting covering of a cell or cell part.
What are the microvilli of the abluminal plasmalemma?
The luminal surface of the high columnar cells is covered with microvilli of different shapes and sizes, while the abluminal plasmalemma forms a rather complex basal labyrinth.