Cardiac Cycle, Ecg And Rhythms Flashcards
Where does the blood enter the heart
Via the vena cava and into the right atrium
Where does the blood go after the right atrium
Then through the tricuspid valve into the right ventricle
Where does the blood go after the right ventricle
From the RV through the pulmonary artery to the lungs and then back to the heart via the pulmonary vein
Where does the blood go after the pulmonary vein
From the pulmonary vein into the the left atrium
Where does the blood go after the left atrium
Then through the bicuspid valve int the left ventricle, from the LV out through the aorta to the body
What are the 6 stages of the cardiac cycle
-isovolumic/ isovolumetric relaxation
-ventricular filling
-atrial contraction
-isovolumic/isovolumetric contraction
-ventricular contraction
-ventricular ejection
What does myogenic mean
the heart muscles will contract in a regular pattern without any nerve input
What is the SAN and where is it located in the body
Sinoatrial node located on the right atrium, it’s also known as the natural pacemaker of the heart due to it maintaining regular contractions of the heart
What is the normal heart rate range
60-100bpm
What system regulates the heart rate and where is it located
Coordinate by the cardioregulatory centre, located in the medulla
What detects changes in the blood pressure and acidity
Chemoreceptors and pressure receptors, located in the aorta and carotid arteries
Why does the electrical signal from the SAN not extend to the ventricles
This is due to a layer of collagen acting as an electrical insulator between the atrium and ventricles
