Intro Class demo: every minute, 5L of blood cycles from heart to the lungs, picks up oxygen, and returns to the heart. The heart then pumps the oxygen-rich blood and nutrients to the body = 2 systems in one!!
Heart Structure (yours is the size of your closed fist!)
Mammalian heart is a double pump separated by a wall of muscle called the SEPTUM
right pump powers pulmonary circuit (BLUE = deoxygenated: pumps blood to the lungs)
left pump powers the systemic circuit (RED = oxygenated: pumps blood to the body)
each pump has a thin-walled ATRIUM (plural: atria) and a thick-walled VENTRICLE
atria (reservoir) receive blood from veins and pump it to the ventricles
more muscular ventricles (pump) then pump the blood to distant tissues
valves of the heart prevent blood from flowing back into ventricles when the heart muscles contract
Special blood vessels leading to and from the heart:
1. AORTA: largest artery in the body that leads directly from the heart and carries oxygenated blood to the tissues of the body.
2. PULMONARY ARTERY: the only artery that does not carry oxygenated blood away from the heart. It carries deoxygenated blood from the heart to the lungs
3. SUPERIOR AND INFERIOR VENA CAVA: carry all the deoxygenated blood from the body to the heart. Superior vena cava goes up from the heart (the blood goes down into the heart) and the inferior goes down from the heart (the blood goes up to the heart)
Blood flow through the heart: RIGHT SIDE a) Into the right atrium of the heart from the superior and inferior vena cavas (body) b) Through the atrioventricular (tricuspid) valve c) Into the right ventricle d) Through the semilunar (pulmonary) valve e) To the pulmonary veins (lungs) LEFT SIDE a) Into the left atrium of the heart from the pulmonary artery (lungs) b) Through the atrioventrocular (bicuspid) valve c) Into the left ventricle d) Through the semilunar (aortic valve) e) To the aorta (body) Note: tricuspid = 3 flaps, bicuspid = 2 flaps
Intro
Class demo: every minute, 5L of blood cycles from heart to the lungs, picks up oxygen, and returns to the heart. The heart then pumps the oxygen-rich blood and nutrients to the body = 2 systems in one!!
Heart Structure (yours is the size of your closed fist!)
Special blood vessels leading to and from the heart:
Blood flow through the heart:
RIGHT SIDE
a) Into the right atrium of the heart from the superior and inferior vena cavas (body)
b) Through the atrioventricular (tricuspid) valve
c) Into the right ventricle
d) Through the semilunar (pulmonary) valve
e) To the pulmonary veins (lungs)
LEFT SIDE
a) Into the left atrium of the heart from the pulmonary artery (lungs)
b) Through the atrioventrocular (bicuspid) valve
c) Into the left ventricle
d) Through the semilunar (aortic valve)
e) To the aorta (body)
Note: tricuspid = 3 flaps, bicuspid = 2 flaps