General/ Systemic Circulation
Move blood between the heart and rest of the body.
Deoxygenated blood
Blood enters heart through two large veins, superior and inferior venacava.
Deoxygenated blood
Superior venacava Inferior venacava
Right atrium
. .. ! Tricuspid vavle
. Right ventricle
. ! Pulmonary valve
Pulmonary artery
Lungs (pulmonary trunk)
Oxygenated blood return to heart Systemic circulation
Pulmonary vein
Left atrium
. ! bicuspid valve
. Left ventricle
. ! Aortic valve
. Aorta
. Systemic circulation
Function of Heart
1. Pumping oxygenated blood to other body parts
2. Pumping hormone and other vital substance to different parts of body.
3. (Produce ANT artrial natriuretic hormone, cardiac hormone; lower blood pressure and control electrolyte homeostasis )
4. Receive deoxygenated blood and pumping it lungs for air exchange.
5. Lung metabolic waste product from body
6. Maintaining blood pumping
7. Circulate nutrient throughout Circulatory system
8. Supply nutrient to tissue and remaining CO2 and other waste.
Coronary Circulation
Circulation of blood in blood vessels that supply the heart muscles (myocardium).
Coronary artery
Supply oxygenated blood to heart muscles.
Coronary arteries supply oxygenated blood to heart muscle and cardiac vein drain the blood once it has been deoxygenated.
Cardiac vein
Cardiac Vein returns deoxygenated blood from myocardium to right atrium through coronary sinus.
Coronary artery and vein
Coronary artery
The arterial supply of coronary circulation is provided by right and left coronary arteries both arising from base of Aorta and encircling heart in coronary sulcus.
Heart receive its own supply of blood from coronary artery.
1. Right coronary artery , Two branches
Arises from Aorta near right cusp of Aortic valve.
A. Marginal artery, serve myocardial, lateral right side of Heart.
B. Posterior interventricular artery (posterior descending artery).
Runs to heart apex and supply posterior ventricular wall.
Together branches of right coronary artery supply right atrium and nearly all right ventricle.
2. Left coronary artery, Two branches
A. Anterior interventricular artery (left anterior descending artery)
B. Circumflex artery
Continue around left side of Heart in coronary sulcus.
It supplies left atrum and small portion of left ventricle.
Aorta
1. Right coronary artery
Marginal artery
Left, Right
Posterior interventricular artery
2. Left coronary artery
Anterior interventricular artery
Circumflex artery
Coronary sinus and coronary veins
Coronary veins
Great cardiac vein Middle cardiac vein Small cardiac vein
At carried blood from apex. Small cardiac vein is in coronary sulcus
.. Coronary Sinus. and drains right side of Heart.
Right Atrium
Anterior view
Posterior view
Pulmonary circuit/ pulmonary circulation
Move blood between heart and lungs.
It carries deoxygenated blood from heart to lungs.
Where CO2 is removed and oxygen is added.
It then returns newly oxygenated blood to heart for distribution to the rest of the body.
It function bring blood into close contact with alveoli of lungs so that gases can be exchanged.
Main blood vessels of pulmonary circulation
1. Pulmonary trunk and two pulmonary arteries
2. Pulmonary capillaries
3. Four pulmonary veins
1. Pulmonary trunk and two pulmonary arteries
These arteries carry deoxygenated blood from right ventricle of Heart to lungs.
2. Pulmonary capillaries
Site of exchange of O2 and CO2 in lungs. Here exchanges of gas take place.
O2 moves from the alveolar air to the blood and CO2 moves from the blood to the alveolar air.
3. Four Pulmonary veins
Four pulmonary veins carry oxygenated blood from lungs to left atrium of Heart.
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