1. Blood Vessels

2. Blood Vessels
Capillaries
Blood travels throughout the body in a series of blood vessels; Arteries, Capillaries, and Veins that each perform a specific function.
Artery
Artery
Capillaries
Capillaries
Vein
Vein
Capillaries

3. Arteries – Pipelines from the Heart
Carry blood away from the heart.
Main transporters of oxygenated blood.
Have very thick walls of stiff connective tissue and smooth muscle.
Because of the pressure the heart needs to beat and send blood throughout the body.
Very elastic allowing them to expand.

4. Arteries

5. Capillaries – Unseen Pipelines
The smallest blood vessels
Connect arteries and veins.
Only one cell thick – “Swiss Cheese”
Site of exchange between blood and cells.
Diffusion of oxygen and nutrients into the cells.
Diffusion of carbon dioxide and wastes away from the cells.

6. Capillaries

7. Veins – Pipelines to the Heart
Carry deoxygenated blood back to the heart.
High in carbon dioxide and waste products.
Thin walls of connective tissue and smooth muscle.
Contain one-way valves to keep blood from flowing backward.
Contractions of skeletal muscles move the blood inside the veins.

8. Veins
vein
vein

9. Blood Pressure
Blood pressure is the force of your blood pushing against the walls of your arteries.
The force is strongest when your heart contracts and weakest when your heart relaxes.
Two locations you can feel your pulse at:
Your neck
Your wrist

10. Blood Pressure Blood pressure is read as two numbers:
Systolic pressure – the pressure on the artery when the ventricles contract.
Diastolic pressure – Pressure on the artery when the ventricles relax.
Normal blood pressure would be 120 over 80.

11. Systemic Blood Pressure Readings

12. Chart Questions: Where is the blood pressure reading the strongest?
Is this person’s blood pressure normal?
What’s the systolic reading?
What’s the diastolic reading?
Where is the blood pressure the weakest?
Arteries
Yes
120 80
Veins