Tugging on my heart strings…..
This is the chordae tendenae. They are connected to the bottom of the hearts valves and help pull them closed.
“Right and left coronary arteries, emerging from the origin of the aorta, veins of the heart and coronary sinus.” illustration by J. M. Bourgery from Atlas of Human Anatomy and Surgery / Atlas d’antomie Humaine et de Chirurgie by Jean Marc Bourgery (1797-1849) Los Angeles: Taschen, 2005. Atlas Case QM 25 .B67 2005
A normal heart rhythm is called normal sinus rhythm (NSR for short). An NSR will have a heart rate (this is the same as the pulse) between 50 and 100 beats per minute and a normal impulse formation from the SA node ( P wave). In the absence of any abnormalities, a completely normal rhythm will also have a normal PR interval (interval from the beginning of the P wave to the beginning of the QRS of .12-.20 seconds), a normal QRS width (time it takes for the ventricles to contract of .04-.10 seconds), a normal QT interval (interval from the beginning of the QRS to the beginning of the T wave of .30-.46 seconds). Also, all the waveforms must be of a normal shape with no ST changes.
Learning this very soon! :)