1. Topic: Circulatory System
Aim: Describe the structure and function of the 3 types of blood vessels.
Do Now: Fill in the word BICONCAVE into your Root Word Organizer
HW: Heart ISN

2. A
Platelets B
Red blood cells
White blood cells C

3. Review: Identify the part of blood being described.
Most numerous blood cell.
Carries enzymes.
Involved in blood clotting.
Carries oxygen.
Largest blood cell.
Made up of 90% water.
Protect the body against disease.
Carries hormones.

4. Did you know…
The body of an adult contains over 60,000 miles of blood vessels!
An adult's heart pumps nearly 4000 gallons of blood each day!
The average three-year-old has two pints of blood in their body. The average adult has at least five times more!

5. Arteries
Capillaries
Veins

7. Capillaries
Arteries
Veins

8. ARTERIES
Carry blood AWAY from heart
Thicker walls

12. Branching arteries in the eye

14. ARTERIES
Carry blood AWAY from heart
Thicker walls
Blood flows at faster rate
High pressure
Pulse
Most arteries carry oxygenated blood

15. Capillaries
Arteries
Veins

16. VEINS
Carry blood TO the heart
Thinner walls
Less pressure
No pulse

23. VEINS
Carry blood TO the heart
Thinner walls
Less pressure
No pulse
Valves: stop blood from flowing backwards
Most veins carry deoxygenated blood

24. Capillaries
Arteries
Veins

26. CAPILLARIES
Tiny blood vessels
Connect arteries to veins
Very thin walls

28. Capillary diameter is very small.
A typical small artery or vein may be 5mm (in diameter in a human)
But a capillaries are approx 10 micrometer about the size of a red blood cell (erythrocyte)

30. Artery
Vein

31. ARTERIES
CAPILLARIES
VEINS

32. Blood vessels in the right arm and shoulder

33. Arteries of the lower leg & blood supply to the face & skull

34. What would happen if the artery that transports oxygenated blood to the heart gets blocked?

35. What would happen if the artery that transports oxygenated blood to the brain gets blocked?

36. Let’s summarize…
Identify the three types of blood vessels.
Why are arteries very muscular?
Identify where each type of blood vessel carries blood?
Why are capillaries so thin?
Why do veins have valves?
In which blood vessel is your pulse felt? Explain why.

37. Review: Identify the type of blood vessel being described.
Low blood pressure
Where diffusion of substances occurs.
Contains valves
Carry blood away from the heart
Connects arteries and veins
Red blood cells move in single file
Elastic and flexible.
Used to feel pulse.