1. CIRCULATORY SYSTEM
THE HEART
AND BLOOD VESSELS

2. Learning Outcomes:
C3 – Describe the interrelationships of the structures of the heart
Identify structures diagrams and give functions and direction of blood flow
C5 – analyze the functional interrelationships of the vessels of the circulatory system
Describe the 5 types of blood vessels in terms of structure and function
Identify and give the function of the blood vessels of the body

3. The Heart Mostly muscle (myocardium) Enclosed in a sac (pericardium)
Right and left side separated by septum
Four chambers:
Right and left atria (receive blood)
Right and left ventricles (pump blood out)

5. Heart Valves Prevent backflow of blood
Atrioventricular valves - between atria and ventricles
(tricuspid on right, bicuspid / mitral on left)
Semilunar valves - between ventricles and arteries
Chordae tendinae support the atrioventricular valves

7. A Double Pump
Right: receives blood from the body and pumps it to the lungs
Left: receives blood from the lungs and pumps it to the body

8. Fig. 13.4b

9. Blood Vessels of the Heart
Superior and inferior vena cava - from upper and lower body to the right atrium
Pulmonary trunk - branches into R and L pulmonary arteries - to the lungs
Pulmonary veins - from lungs to heart
Aorta - from left ventricle, branches to all parts of the body
Coronary arteries - supply the heart muscle

10. Fig. 13.3b

11. Fig. 13.4a

12. BLOOD VESSELS
5 types
arteries - carry blood away from the heart; thick, muscular walls
arterioles – smaller branches of the arteries
veins – carry blood toward the heart; thinner walls, have valves to prevent backflow
venules – smaller branches of veins
capillaries – networks of microscopic vessels in all tissues; walls are very thin (one cell thick); connect veins and arteries; supply cells with nutrients

13. Fig. 13.1

14. Fig. 13.2

15. Assignment
Draw arrows in red and blue on your diagram to show the flow of oxygenated and deoxygenated blood through the heart
List in order all the structures blood would flow through as it passes through the heart and lungs, starting with the vena cava and ending with the aorta