1. The Blood Vessels
Roadways of the Body

2. What do Blood Vessels Do?
Carry Blood!
Exchange nutrients, wastes, and gases with tissues
Transport
Help maintain blood pressure
Direct blood flow to tissues (when increased or decreased blood flow is required)

3. Three types of blood vessels
Arteries
Veins
Capillaries

4. Three major parts of blood vessels:
Tunica Intima:
The innermost layer; consists of simple squamous epithelium
Tunica Media:
The middle layer; consists of smooth muscle and elastic and collagen fibers
Tunica Adventia:
The outermost layer; consists of connective tissue

6. Arteries: Thick muscular walls
Blood moving under high pressure and speed
Blood is oxygenated (except pulmonary arteries)
Always take blood away from the heart
Branch into arterioles
Arterioles branch into capillaries

7. Capillaries:
Consist of a single layer of endothelium only one cell thick
The site of nutrient, waste, and gas exchange between the blood and the body cells

8. Veins: Capillaries flow into venules Venules flow into veins
Veins have thinner walls
Blood moves under lower pressure and slower speed
Veins need valves to keep blood moving in the correct direction
Always take blood to the heart
Carry deoxygenated blood (except the pulmonary veins)

11. Heart Vessels: Right common carotid artery Right internal jugular vein
Right subclavian artery
Brachiocephalic artery
Brachiocepahlic vein
Superior vena cava
Left common carotid artery
Left internal jugular vein
Left subclavian artery
Aortic arch

12. Major Arteries: Brachial Ascending aorta Subclavian Common carotid
Brachiocephalic
Descending aorta
Coronary
Abdominal aorta
Common illiac
femoral

13. Major Veins: Brachial Brachiocephalic Jugular Subclavian
Superior vena cava
Coronary
Inferior vena cava
Iliac
Femoral
Great saphenous