1. Topic: Circulatory System
Aim: Describe the structure and function of the 3 types of blood vessels.
Do Now: Practice Questions…
HW: Read pgs Write a paragraph describing enzymes, their role in digestion and their role in other life processes.
(Packing Fat Reading Comprehension due on Monday!)

2. 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

11. Branching arteries in the eye

12. Capillaries
Arteries
Veins

18. Capillaries
Arteries
Veins

21. 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)

24. Arteries
Capillaries
Veins

25. Arteries
AWAY from heart
THICK and ELASTIC
Experiences most pressure (PULSE)
Capillaries
Veins

26. Experiences most pressure (PULSE)
Arteries
AWAY from heart
THICK and ELASTIC
Experiences most pressure (PULSE)
Capillaries
SMALLEST
Connect arteries to veins
Exchange (diffusion) of materials bw blood and cells
- O2: from alveoli into capillaries
- CO2 and H2O vapor: capillaries  alveoli
Veins

27. Experiences most pressure (PULSE)
Arteries
AWAY from heart
THICK and ELASTIC
Experiences most pressure (PULSE)
Capillaries
SMALLEST
Connect arteries to veins
Exchange (diffusion) of materials bw blood and cells
- O2: from alveoli into capillaries
- CO2 and H2O vapor: capillaries  alveoli
Veins
TO the heart
THIN and NOT VERY ELASTIC
VALVES (prevent backflow of blood)

29. Artery
Vein

30. ARTERIES
CAPILLARIES
VEINS

31. Blood vessels in the right arm and shoulder

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

33. 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.

34. 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.