1. Do Now separate sheet of paper
1. What are the two types of natural resources?
2. What is an Ecological footprint?
3. How do humans negatively impact the environment?
4. What is sustainable development?
5. What is an invasive species? How does it impact biodiversity?
6. How do humans impact biodiversity?
Do Now separate sheet of paper
What is a limiting factor?
What is carrying capacity?
What two factors increase the population size?
How much energy is transferred up a trophic level?
Big Goal?

2. How do lifestyle choices affect blood flow in the body?
Blood Flow SC.912.L Describe the factors affecting blood flow through the cardiovascular system
How do lifestyle choices affect blood flow in the body?

3. Cardiovascular System
Blood full of oxygen flow from the heart through:
Arteries of decreasing size
Capillaries deliver oxygen to cells
Veins return oxygen-poor blood to the heart and lungs.
Blood brings vital supplies, oxygen and nutrients, to the cells and carries away their wastes.

4. Pathways of Blood Flow
Pulmonary Circulation: occurs between the heart and lungs; carries oxygen-poor blood to the lungs, where it picks up O2 and eliminates CO2 and water; carries oxygen-rich blood back to the heart
Systemic Circulation: occurs between the heart and rest of the body; carries oxygen-rich blood to the cells

5. Factors That Affect Blood Flow: Blood Pressure
Blood Pressure – the heart ventricle contracts and creates a force, or blood pressure on the arteries.
The greater the force = faster the flow
Blood receives oxygen from the lungs and delivers it to other organs
Heart pumps blood around the body
BP- caused by circulating blood flow on walls of veins and arteries

6. Factors That Affect Blood Flow: Blood Pressure
Factors that can affect blood pressure
Elasticity and blockage
Less elastic and more blockage = reduce blood flow = harder the heart beat = blood pressure rises
Normal elasticity and no blockage = normal blood flow, heart beat and pressure
Exercise, stress and strong emotions
Cause a natural increase but drops when at rest.

7. Blood Pressure Conditions
Hypertension – high blood pressure = overworks the heart and puts stress on the blood vessels.
Low blood pressure – your cells do not get enough oxygen and other necessary supplies.

8. Factors That Affect Blood Flow: Size of Blood Vessels
diameter of blood vessels
the larger the vessel, the faster the flow (think about drinking out of a straw vs. a water hose!)
blood vessels constrict or reduce diameter during smoking

9. BLOOD VOLUME AFFECTS
Excessive salt intake can lead to a high concentration of sodium and chloride within the bloodstream, reducing the water in the blood.
Which property of water is at play?

10. Factors That Affect Blood Flow: Viscosity
Blood Viscosity = thickness of blood
Thin blood flows faster than thick blood
Think of pouring syrup vs. soda
The thicker or more viscous the blood the harder the heart will have to work/pump = increased blood pressure
Eating a lot of junk food (high in cholesterol) would increase viscosity and decrease blood flow, as cholesterol will be deposited into the blood.
What would be the effect of eating a lot of junk food?

11. Factors That Affect Blood Flow: Resistance
Resistance by narrow or blocked blood vessels = decrease blood flow
Narrow or smaller vessels
Blood vessels constrict or reduce diameter
Blocked blood vessels
Blocked by plaque build up on the walls
Plaque – deposits of cholesterol, calcium and fat
Narrow or blocked blood vessels causes
circulated blood volume per minute decreases

12. Viscosity and Resistance
Viscosity: the property used to describe how thick a liquid is
Resistance: an opposing force

13. Factors That Affect Blood Flow: Disease
Atherosclerosis
Blood flood is partially or fully blocked by plaque build up on the walls of arteries
Associated with high blood pressure
Arteriosclerosis
Blood becomes thick and inflexible
Causes blood pressure to increase

14. Cardiovascular Health
Good for the Heart
Bad for the Heart
Healthy diet
Variety of fruits, vegetables and whole grains
Moderate amounts of other carbohydrates and proteins
Regular exercise
No smoking
Maintaining a healthy weight
Avoid stress
Diets high in fats, cholesterol and salt
No exercise
Smoking
Overweight
Too much stress

15. Exercise Increases blood pressure Increases blood flow
More blood to muscles and less to stomach
Same blood to brain
Heart beats faster and harder to get more oxygen to cells

16. Ha!
A red blood cell walked into a busy restaurant. The hostess asked, “Would you like sit at a table?” The red cell replied, “No thanks, I’ll just circulate.”

17. Stations C- level 2 voice (group should hear you and no one else)
There are 5 stations in the back of the room testing the affects of the cardiovascular system. You will have 6 min at each station.
C- level 2 voice (group should hear you and no one else)
H- ask three before me (then raise your hand)
A- complete the activity at your station and then rotate when the timer rings
M- during work time, remain at your station, only move once the timer has gone off. You will have 15 seconds between stations.
P- work with your group to complete each station and fill out your data sheet
SUCCESS

18. Exit ticket time!
Put everything away and clear your desk

19. What factors affect blood flow through the body?