Transcript Heartx

1. What is the circulatory system?
A. The body's breathing system
B. The body's system of nerves
C. The body's food-processing system
D. The body's blood-transporting system
2. Label as many components as possible in the heart diagram.
(we will do this in our notes)
3. Name the artery that supplies the heart muscles with blood.
coronary artery
4. The _____ valve lies between the right atrium and right ventricle.
A. right semilunar valve
B. left semilunar valve
C. right atriventricular valve
D. left atrioventricular valve
5. Vasodilation is when ______.
A. muscles expand
B. blood vessels expand
C. muscles shrink
D. blood vessels shrink
6. The smallest blood vessels are _______-.
A. capillaries
B. arteries
C. veins
A pair of side by side pumps
that work simultaneously
 Each side contains:

› An ATRIUM; on top, a thin-
walled collection chamber for
blood moving in slowly from
the veins
› AVENTRICLE; thick-walled
muscular pump that sends
blood out of the heart

The goal of the transport system is to take
deoxygenated blood to the lungs to get reoxygenated and then return that blood to the
heart so that it can be pumped out to the rest
of the body

Path of deoxygenated blood around the right
side of the heart and lungs:
› deoxygenated blood enters from the vena cava
› into the right atrium (through right atrioventricular
›
›
›
›
valve)
down to the right ventricle (through right semilunar valve)
To lungs via pulmonary artery
Blood gets re-oxygenated in lungs
Oxygen-rich blood returns to heart via pulmonary
vein

Path of oxygenated blood around the left
side of the heart and then out to the body:
› Left atrium (through left atrioventricular valve)
› Down to left ventricle (through left semilunar
valve)
› Out to body via aorta
› To body tissues/cells (each complete circuit
around the body pulmonary + systemic takes
about 1-2 minutes)
Let’s Review our Heart Diagram
Let’s
Sing!
Right semilunar valve
Left semilunar valve
left atrioventricular valve
Right atrioventricular valve
1. Right and left atrium (small)
2. Right and left ventricle (larger)
3. Right atrioventricular valve
2. Left atrioventricular valve
3. Right semilunar valve
4. Left semilunar valve
5. Vena cava
6. Aorta
7. Pulmonary artery
8. Pulmonary vein
NOTE: Muscle
walls should be
thinner on right
side and thicker
on left side

Children can be born with congenital heart
defects and adults can develop heart valve
disease (discovered via heart murmurs)
› Common Valve Issues
 Regurgitation - backflow when the
valve does not close tightly
 Stenosis – the valves thicken and
stiffen and prevent valves from
fully opening
 Atresia – heart valves lack an
opening
Left av valve prolapse
atresic right av valve
stenosis