Glossary of Physiology Terms – R
Resting membrane potential
The voltage difference across a cell plasma membrane in the resting or quiescent state. It is also simply referred to as the resting potential (Vrest
). The value of the resting membrane potential varies from cell to cell. Depending on the cell type, it can range from −90 mV to −20 mV.
For example, Vrest
is −90 mV in skeletal and cardiac muscle cells as well as in astrocytes. In a typical neuron, Vrest
is approximately −70 mV. In many non-excitable cells, Vrest
ranges from −60 to −50 mV. In photoreceptors, Vrest
is about −20 mV.
See also:Resting membrane potential
Moving from the axon terminal back toward the neuronal cell body.
Related glossary terms/phrases:Anterograde
Right atrioventricular valve
The one-way valve between the right atrium and right ventricle of the heart. It is also known as the tricuspid valve
The direction of blood flow through the right atrioventricular valve is from the right atrium to the right ventricle.
Related glossary terms/phrases:Tricuspid valve
Posted: Tuesday, July 3, 2012
Last updated: Saturday, January 10, 2015