1. Blood Vessels

2. Tidbits your blood vessels are hollow tubes that circulate your blood
If you took all of the blood vessels out of an average child, and laid them out in one line, the line would be over 60,000 miles long!
An adult's vessels would be closer to 100,000 miles long!

3. 3 Types of Blood Vessels
Arteries
Veins
Capillaries

4. 1. Arteries Carry blood away from the heart Carry oxygenated blood
with one exception

5. Arteries
The walls of arteries (left) are thicker than that of veins (right)
Arteries are tough on the outside and smooth on the inside.
An artery actually has three layers:
outer layer of tissue
muscular middle (elasticity helps move blood along)
inner layer of epithelial cells

6. Movement of Blood Through Arteries
Arteries are located deep near the bones (with a few exceptions)
Arterial blood is pumped by the heart under high pressure
Pulse (= heart rate)
The contraction of the artery keeps pace with the beat of the heart.
Blood pressure
blood flowing through the arteries because it has a higher pressure than the blood in the veins
uses two numbers; systole(under pressure) and diastole(minimum pressure). The walls of arteries are thicker than that of veins

7. Major Arteries of Circulation
Aorta
Largest artery in the body
Leaves from the left ventricle of the heart
Regions
Ascending aorta
Aortic arch
Thoracic aorta
Abdominal aorta —passes through the diaphragm into the abdominopelvic cavity

8. Vessels of the Aortic Arch
Brachiocephalic
Left common carotid
Left subclavian

9. Arterial Supply of the Brain
Internal carotid arteries divide into
Anterior and middle cerebral arteries
These arteries supply most of the cerebrum

10. 2. Capillaries walls are only one cell layer thick
some allow for only one RBC to pass at a time
allow for exchanges between blood and tissue
Arteriole- small branch of artery leading into a capillary.
Venule- small branch of vein receiving blood from a capillary

11. Veins Carry blood to the heart
Carry deoxygenated blood (with one exception)
The walls of veins are thinner, however the lumen is larger
Veins are more superficial near the skin (with a few exceptions)
Veins are under low pressure

12. Movement of Blood Through Veins
Larger veins have valves to prevent backflow
Veins use the “milking” action of muscles to help move blood

13. Major Veins of Circulation
Vena Cava
Largest vein in the body
Returns blood to the right atrium
Regions
Superior vena cava drains the head and arms
Inferior vena cava drains the lower body