Heart Structure Flashcards
Blood first goes through the right atrium which has :
Superior vena cava
Draining the head and thorax and upper limbs
Lower vena cava
Draining the lower body
Usually the blood going through the right atrium is blue
Because it’s deoxygenated
So when the atria gives a little bit of a pump it pushes down into
The right ventricle
When the right ventricle pumps up blood
It pushes up and out blood to the Pulmonary trunk and out the pulmonary arteries(which sends blood to left and right lungs)
The tricuspid valve or right atrial vantricular valve
When the right ventricle contracts the papillary muscles that has string (called collagen fibers cordae tendinae) connect to the valve and holds the valve closed so blood doesn’t go through it
And then after the right ventricle gets contracted and enough blood is getting pushed up it goes through the
The pulmonary Semilunar valves
Right av valves close(tricuspid valves)
During ventricular contractions and pulmonary semilunar valves closed after ventricular contractions
The oxygenated blood returns via
Pulmonary veins from the right and left lung
When the left atrium contracts
It pushes blood to the left ventricle and those papillary muscles are also found in the left ventricle that hold shut the av valve (bi cuspid)
During the left ventricle contraction
Blood is pumped out and into the aorta but the only way it can actually go through the aorta is if they pass the aortic semilunar valve
This whole process with both sides
Are happening at the same
Time just doing different things
Right and left coranary arteries
Causes heart attacks if there is a plaque build up their won’t be enough oxygen getting sent to heart causing the hear attack.
The myocardium is thin on right side and thick on left side because
Left Side of the Heart: The left ventricle has a much thicker myocardium because it needs to generate a lot of force to pump oxygenated blood through the aorta and into the rest of the body. Since the body is large and the blood has to travel a long distance, the left side needs to exert more pressure.
Right Side of the Heart: The right ventricle, on the other hand, only pumps blood to the lungs (a shorter distance), so it doesn’t need as much force. Therefore, the myocardium on the right side is thinner.
Middle part of heart is called the
Intraventricular muscle
which are part of the interventricular septum—the thick muscular wall that separates the right and left ventricles of the heart.
The three large branching arteries branching off of the aorta is
Brachial(arm) cephalic(head) sends oxygenated blood to the arm and to the head
The middle one is called the left common carotted( it sends blood to the left side of the head up the neck)
The left subclavian arterie sends blood to the left arm
