Heart - SD57 Mail
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Transcript Heart - SD57 Mail
CIRCULATORY SYSTEM
THE HEART
AND BLOODVESSELS
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
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)
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
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
Fig. 13.4b
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
Fig. 13.3b
Fig. 13.4a
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
Fig. 13.1
Fig. 13.2
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