Results 241 to 250 of about 22,194 (282)
Some of the next articles are maybe not open access.
Reconstruction of the human sinoatrial node
The Anatomical Record, 1967AbstractThe superior vena cava and adjacent right atrium containing the sinoatrial node in each of five human hearts was studied histologically in serial section. The tissue block of a 41 year old man was reconstructed in four colors to provide a three‐dimensional model of the sinoatrial node, atrial relations, blood supply and nodal configuration. The
R C, Truex, M Q, Smythe, M J, Taylor
openaire +2 more sources
Cardiovascular Drugs and Therapy, 1988
The sinoatrial node (SAN) was discovered in 1906 by Keith and Flack. The relation between its ultrastructure and function was first studied by Trautwein and Uchizono in 1963, whereas this relation was definitely established by Taylor and coworkers in 1978. The impulse originates from cells with a relatively low percentage of myofilaments.
openaire +2 more sources
The sinoatrial node (SAN) was discovered in 1906 by Keith and Flack. The relation between its ultrastructure and function was first studied by Trautwein and Uchizono in 1963, whereas this relation was definitely established by Taylor and coworkers in 1978. The impulse originates from cells with a relatively low percentage of myofilaments.
openaire +2 more sources
Functional morphology of the pig sinoatrial node
Journal of Molecular and Cellular Cardiology, 1987The porcine sinoatrial node in an isolated right atrium preparation is characterized by unifocal impulse generation. It has a rather elongated shape and the larger part of its volume is taken up by collagen and fibroblasts. The impulse appears to emerge from a site where the percentage of myofilaments is relatively low. The impulse is propagated faster
T, Opthof +3 more
openaire +2 more sources
Connexins in the Sinoatrial and Atrioventricular Nodes
2006The sinoatrial node (SAN) and the atrioventricular node (AVN) are specialized tissues in the heart: the SAN is specialized for pacemaking (it is the pacemaker of the heart), whereas the AVN is specialized for slow conduction of the action potential (to introduce a delay between atrial and ventricular activation during the cardiac cycle).
Boyett, M. R. +12 more
openaire +2 more sources
Disturbances of Sinoatrial Node Function
2000The spectrum of human cardiac performance is amazingly broad with cardiac output varying 10–20-fold between that measured during the deepest of sleep to that seen at peak of exercise. In large part this tremendous cardiac reserve is modulated both by cardiac contractility as well as the heart rate itself.
Ruey J. Sung, Michael R. Lauer
openaire +1 more source
Parasympathetic postganglionic pathways to the sinoatrial node
American Journal of Physiology-Heart and Circulatory Physiology, 1990Vagal ganglia that innervate the canine sinoatrial node (SAN) have been localized to a fat pad overlying and surrounding the right pulmonary vein complex (PVFP). The ventral epicardial surface of the right atrium was mapped in seven dogs anesthetized with alpha-chloralose after beta-blockade (timolol) and cardiac sympathetic and parasympathetic ...
K M, Bluemel +4 more
openaire +2 more sources
Ultrastructure of electrophysiologically identified human sinoatrial nodes
Basic Research in Cardiology, 1988The ultrastructure of freshly excised human sinus node tissue was studied. In three female patients (ages 20, 30, and 36 years) medically refractory disabling episodes of inappropriate sinus tachycardia were surgically treated by extirpation of the sinus node.
J E, Lowe +3 more
openaire +2 more sources
Phase Response of Model Sinoatrial Node Cells
Annals of Biomedical Engineering, 2003When a brief current pulse is incident on excitable cells in cardiac and other nervous tissue, a change in phase of the cell's response is usually observed. In cardiac tissue, the cells are exposed to external stimulation of mainly positive currents, which depolarize the cells.
A C F, Coster, B G, Celler
openaire +2 more sources
1976
The impulse for the activation of the heart is generated normally in the sinoatrial node (SA node). This structure covers an area of only a few square millimeters. The cells have an irregular contour and are small (diameter less than 10 μ). Furthermore, they contain sparse myofilaments which are often not well organized. The intercellular junctions are
openaire +1 more source
The impulse for the activation of the heart is generated normally in the sinoatrial node (SA node). This structure covers an area of only a few square millimeters. The cells have an irregular contour and are small (diameter less than 10 μ). Furthermore, they contain sparse myofilaments which are often not well organized. The intercellular junctions are
openaire +1 more source
ICI D7288, a Novel Sinoatrial Node Modulator
Journal of Cardiovascular Pharmacology, 1993We evaluated the cardiovascular effects of the sinoatrial (SA) node modulating agent, ICI D7288, in guinea pig isolated atria and SA node, anaesthetised and exercising dogs, and conscious rats. ICI D7288 (0.1-100 microM) caused a reduction in spontaneous beating rate in guinea pig isolated right atria without affecting the contractile force of paced ...
P W, Marshall +5 more
openaire +2 more sources