1. Do Now Put belongings away
If completed, have HW and Vocab on your desk for check
Complete the Regents questions for grade
Flip over when completed.

2. How Blood Gets Around Your Body
Blood Vessels!
How Blood Gets Around Your Body

3. Two Systems of Circulation
Pulmonary circulation: between heart and lungs (exchange gasses)
Systemic circulation: between heart and rest of body cells (gas, nutrient, and waste exchange)

4. blood from the heart gets around the body through blood vessels
There are 3 types of blood vessels
a. ARTERY
b VEIN
c CAPILLARY

5. Arteries carry blood away from the heart.
The ARTERY
Arteries carry blood away from the heart.
the elastic fibres allow the artery to stretch under pressure. As a packet of blood goes thru the pulse is felt.
thick muscle and elastic fibres
the thick muscle can contract to push the blood along.

6. Veins carry blood from the body towards the heart.
The VEIN
Veins carry blood from the body towards the heart.
veins have valves which act to stop the blood from going in the wrong direction.
thin walls that are slightly pinched

7. Figure 42.9 Blood flow in veins

8. The CAPILLARY Capillaries link Arteries with Veins
they exchange materials between the blood and other body cells.
the wall of a capillary
is only one cell thick
The exchange of materials between the blood and the body can only occur through capillaries.

9. Figure 42.12 Blood flow in capillary beds
Blood Vessels become smaller as they move away from the heart
Approaching capillaries, veins and arteries must get thinner to ensure capillaries do not burst.
The smallest veins leading to capillaries are called venules
The smallest arteries leading to capillaries are called arterioles.

10. The CAPILLARY artery ICF vein capillaries body cell
A collection of capillaries is known as a capillary bed.
artery
ICF
vein
capillaries
The capillary bed is surrounded by interstitial fluid – the materials move from the blood to (ICF) to the cells.
body cell

11. LDL and High Fat Diets
Low Density Lipoprotein (bad cholesterol) forms deposits in veins
Can contribute to:
Blood Clots
Heart Attacks
Cardiovascular disease

12. Exit Ticket 1. Is Vessel B an artery, capillary, or vein?
2. Which vessels contain valves to prevent the backflow of blood?
3. What is a venule and what does it connect to? A B