Quantcast

Latest HCN channel Stories

2011-09-09 13:29:04

Ion channels ensure the heart keeps time The heartbeat is the result of rhythmic contractions of the heart muscle, which are in turn regulated by electrical signals called action potentials. Action potentials result from the controlled flow of ions into heart muscle cells (depolarization) through channels in their membranes, and are followed by a compensating reverse ion current (repolarization), which restores the original state. If the duration of the repolarization phase is not just...

2011-08-02 14:11:11

An international team of molecular scientists have discovered that star ascidians, also known as sea squirts, have pacemaker cells similar to that of the human heart. The research, published in the JEZ A: Ecological Genetics and Physiology, may offer a new insight into the early evolution of the heart as star ascidians are one of the closest related invertebrates to mammals. The research team, led by Annette Hellbach from the Max Planck Institute of Biochemistry in Germany, expected to find...

2010-08-17 17:05:33

New research in the Journal of General Physiology helps explain how the body's "flight-or-fight" response is mediated. The study, which may provide new answers to the question of how the heart pacemaker"”the sinoatrial (SA) node"”is regulated, appears online on August 16 (www.jgp.org). When the body goes into "flight-or-flight" response as a reaction to stress, the increased firing rate of the SA node increases the heart rate and cardiac output to deliver more oxygen and nutrients...

dd7ee53c515d3a40dc96e879ca7cbae91
2009-04-09 13:29:39

Artificial heart pacemakers have saved and extended the lives of thousands of people, but they have their shortcomings "“ such as a fixed pulse rate and a limited life. Could a permanent biological solution be possible? Richard Robinson and colleagues at New York's Columbia and Stony Brook Universities certainly think so, and their work published in the latest issue of The Journal of Physiology brings the dream a step closer to reality. The body's own natural pacemaker, called the...


Word of the Day
blee
  • Color; hue; complexion.
This word is Middle English in origin.
Related