1. Circulatory System

2. THE CIRCULATORY SYSTEM
transports oxygen & nutrients throughout the body
carries away wastes

3. Main Parts of the Circulatory System
Heart – the pump
Blood – fluid in
which materials
are transported
Vessels – Tubes to
carry the blood

4. Blood
A connective tissue circulating through the body “connecting” all parts
It contains 4 parts:
Red blood cells
White blood cells
Platelets
Plasma
Red Blood Cell
White Blood Cell
Platelets

5. what’s in Nutrients from food red blood cells white blood cells oxygen
waste (urea)
platelets
carbon dioxide
hormones
plasma

6. Red Blood Cells Make up ½ of blood’s volume.
contain hemoglobin, which transports O2 to organs and CO2 away from organs
Did you know…
- It takes about 20 seconds for a RBC to circulate the entire body

7. White Blood Cells fight infection – bacteria and viruses
Less than 1% of blood volume

8. Platelets
Tiny cells - help blood clot
Less than 1% volume

9. Plasma
Liquid that carries blood components
Over ½ of volume

11. Blood Vessels Network of tubes that carry blood 3 types of vessels
Arteries Veins Capillaries

12. the thick muscle can contract to push the blood along.
Arteries
Carry O2 rich blood away from the heart
Thick muscular wall due to extreme pressure
the thick muscle can contract to push the blood along.
thick muscle and elastic fibres

13. Q: What’s the difference between a heart attack and a stroke?
Both are caused by an artery being blocked and blood not getting to an organ.
When blood cannot get to the heart muscle, the heart muscle starts to die – this is a heart attack.
When Blood cannot get to the brain, that portion of the brain starts to die – this is a stroke.

14. A person is complaining that they can’t feel their fingertips and can’t move their leg. They are also feeling very confused.
Question: Is this person most likely having a heart attack or a stroke?

15. Answer:
This person is having a stroke.
The brain controls movements, feelings and thinking. Because blood, and therefore oxygen is not getting to their brain, that section of the brain is dying and can no longer do its job.

16. The CAPILLARY
-Network throughout body
-only one cell thick to enable gas and nutrient exchange.

17. valve The VEIN - carry blood back to the heart
-lower pressure so wall are not as thick
thin muscle
valve
plasma
red blood cell
white blood cell
platelets

19. The Heart
Composed of cardiac muscle tissue, nerve tissue and connective tissue
Pumps blood around body
Nerve cells (pacemaker cells) send electrical signal to contract heart.
Human heart has 4 chambers.
Heart beat depends on oxygen needed by body

20. Animation
Contraction animation
Video of human heart

21. DID YOU KNOW? Did you know…
Your circulatory system is about 60,000 miles long
Your heart beats more than 2.5 billion times in the average lifetime
the human heart creates enough pressure when it pumps out to the body to squirt blood 30 feet.

22. Blood Circulation Right side of heart pumps blood to lungs
Diffusion of gases in lungs (O2 in, CO2 out)
Blood goes to left side of heart and pumps into arteries
Arteries get smaller and smaller until they are capillaries
In Capillaries, O2 & nutrients diffuse into cells, CO2 out.
Blood flows into veins into right side of heart.

24. Video

25. Coronary Artery Disease and Heart Attacks
Many conditions affect the function of the circulatory system. The most common heart problem is coronary artery disease, which can lead to a heart attack.

26. Read – Pair - Share
Pick a partner.
On pages 85 or 86, you will read about either Coronary Artery Disease or Heart Attacks, your partner will read the other.
Fill in one half of the Medical Facts Sheet with point form notes
Explain what you learned to your partner. Help you partner fill in the missing side of their notes.