3. The pulmonary circulation
• The principal divisions of the circulatory
blood flow are the pulmonary and
systemic circulations.
• The pulmonary circulation includes
blood vessels that transport blood to the
lungs for gas exchange and then back
to the heart.
5. The pulmonary circulation
It consists of:
• the right ventricle that ejects the blood.
• the pulmonary trunk with its pulmonary
valve,
• the pulmonary arteries that transport
deoxygenated blood to the lungs,
• the pulmonary capillaries within each lung,
• the pulmonary veins that transport
oxygenated blood back to the heart, and
• the left atrium that receives the blood from
the pulmonary veins.
8. The systemic circulation
• The systemic circulation involves all of the
vessels of the body that are not part of the
pulmonary circulation.
• It includes the right atrium, the left ventricle,
the aorta with its aortic valve. all of the
branches of the aorta, all capillaries other
than those in the lungs involved with gas
exchange, and all veins other than
the pulmonary veins.
11. The systemic circulation
• The right atrium receives all
of the venous return of
oxygen depleted blood from
the systemic veins.
13. Coronary Circulation
• The wall of the heart has its own supply
of blood vessels to meet its vital needs.
• The myocardium is supplied with blood
by the right and left coronary arteries .
• These two vessels arise from the
ascending part of the aorta, at the
location of the aortic (semilunar) valve.
16. Coronary Circulation
• The coronary arteries encircle the
heart within the atrioventricular
sulcus, the depression between the
atria and ventricles.
• Two branches arise from both the
right and left coronary arteries to
serve the atrial and ventricular
walls.
18. Coronary Circulation
• The left coronary artery gives rise
to the anterior interventricular
artery, which courses within the
anterior interventricular sulcus to
serve both ventricles, and the
circumflex artery, which supplies
oxygenated blood to the walls of the
left atrium and left ventricle.
21. Coronary Circulation
• The right coronary artery gives rise to
the right marginal artery, which serves
the walls of the right atrium and right
ventricle; and the posterior
interventricular artery, which courses
through the posterior interventricular
sulcus to serve the two ventricles.
• The main trunks of the right and left
coronaries anastomose (join together) on
the posterior surface of the heart.
23. Coronary Circulation
• From the capillaries in the
myocardium, the blood enters the
cardiac veins.
• The course of these vessels parallels
that of the coronary arteries.
• The cardiac veins, however, have
thinner walls and are more superficial
than the arteries.
24. Coronary Circulation
The two principal cardiac veins are
• the anterior interventricular vein,
which returns blood from the
anterior aspect of the heart, and
• the posterior cardiac vein, which
drains the posterior aspect of the
heart.
29. Coronary Circulation
• These cardiac veins converge to
form the coronary sinus
channel on the posterior surface
of the heart .
• The coronary venous blood then
enters the heart through an
opening into the right atrium.