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The funny current is highly expressed in spontaneously active cardiac regions, such as the sinoatrial node (SAN, the natural pacemaker region), the atrioventricular node (AVN) and the Purkinje fibres of conduction tissue. The funny current is a mixed sodium–potassium current that activates upon hyperpolarization at voltages in the diastolic ...
Dario DiFrancesco (born 10 February 1948) [1] is a Professor Emeritus at the University of Milano.In 1979, he and collaborators discovered the so-called "funny" (or "pacemaker") current in cardiac pacemaker cells, [2] a new mechanism involved in the generation of cardiac spontaneous activity and autonomic regulation of heart rate. [3]
However, in pacemaker cells, this potassium permeability (efflux) decreases as time goes on, causing a slow depolarization. In addition, there is a slow, continuous inward flow of sodium, called the "funny" or pacemaker current. These two relative ion concentration changes slowly depolarize (make more positive) the inside membrane potential ...
Pacemakers are also sometimes used to regulate the heartbeats in people with congenital heart disease, a group of conditions that affect about 1% of people born in the U.S., according to the ...
HCN4 is the main isoform expressed in the sinoatrial node, but low levels of HCN1 and HCN2 have also been reported.The current through HCN channels, called the pacemaker current (I f), plays a key role in the generation and modulation of cardiac rhythmicity, [13] as they are responsible for the spontaneous depolarization in pacemaker action potentials in the heart.
Hyperpolarization-activated cyclic nucleotide-gated channels (HCN channels) are located mainly in pacemaker cells, these channels become active at very negative membrane potentials and allow for the passage of both Na + and K + into the cell (which is a movement known as a funny current, I f). These poorly selective, cation (positively charged ...
Image credits: Furious Thoughts You can also use Google Earth to explore the planet and various cities, locations, and landscapes using coordinates.The program covers most of the globe (97% back ...
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