1. Nervous System Kahoot Review!
No Q.Q.!
Nervous System Kahoot Review!

2. Circulatory System
Unit #10: Human Body Systems

3. What is the role of your circulatory system?
The circulatory system carries blood and dissolved
substances to and from different places in the body.
Important substances include:
Oxygen
Carbon Dioxide
Dissolved nutrients
Water

4. What are the main parts of the circulatory system?
The heart pumps important substances around the body.
Blood vessels such as veins, arteries, capillaries serve as tunnels to move substances through the body.

5. Our circulatory system is a double circulatory system.
This means it has two SEPARATE pathways.
Lungs
Body cells
the right side of the system
deals with deoxygenated blood.
the left side of the system
deals with oxygenated blood.
blood from
the
body
blood from the lungs
Right
Left

6. Now lets look at the outside of the heart…
This is a vein. It brings deoxygenated blood from the body, except the lungs.
These are arteries. They carry oxygenated blood away from the heart.
Coronary arteries, the hearts own blood supply for muscle contractions and pumping.
The Heart

7. The Inside of the Heart
The human heart has four chambers (rooms holding blood) inside, connected to the blood vessels.
*atria = plural form of atrium!
1) Right Atrium
2) Left Atrium
3) Right Ventricle
4) Left Ventricle

8. Heart Chambers
Each upper chamber, or atrium, receives blood from the body.
Each lower chamber, or ventricle, pumps blood out of the heart.
*V shaped for ventricle!
*A comes before V

9. The Inside of the Heart
Valves are flaps of tissue that open and close to separate blood in each chamber.
valve
valve
valve
valve

10. Heart Structure
Bicuspid

11. Label the Heart Diagram
_heart.html

12. Q.Q. 4/5/19
The functions of valves in the human circulatory system is to
serve as a cushion to prevent heart damage.
prevent the backflow of blood.
accelerate the flow of blood.
stimulate the heartbeat.

13. Label the Heart practice
Check yourself!
Label the Heart practice

14. There are 3 types of blood vessels
a. ARTERY
b VEIN
c CAPILLARY

15. Arteries A = AWAY
Arteries are large vessels that carry blood AWAY from the heart to the tissues of the body.
EXCEPT for the pulmonary arteries, ALL arteries carry oxygen -rich blood.

16. ARTERY STRUCTURE
the elastic fibers allow the artery to stretch under high pressure
thick muscle and elastic fibers
the thick muscle can contract to push the blood along.

17. Capillaries Arteries eventually get smaller and form capillaries.
Capillaries are the smallest blood vessels, so narrow that blood cells pass through them in single file.
Capillaries link arteries with veins
Capillary Blood Flow in a Frog

18. CAPILLARY STRUCTURE
Capillaries are the areas of exchange between the blood and other body cells.
the wall of a capillary
is only one cell thick
*Extremely thin!
The exchange of oxygen and carbon dioxide diffuses across the capillaries.

19. A collection of capillaries is known as a capillary bed, which will touch every cell in the body!
artery
vein
capillaries
body cell

20. Veins
After blood passes through the capillaries, it returns to the heart through veins.

21. VEIN STRUCTURE thin muscle and elastic fibers
veins are thinner and have valves, which act to stop the blood from going in the wrong direction.
thin muscle and elastic fibers
Skeletal muscles surround the veins, so that when they contract to move the body, they also squeeze the veins and push the blood along the vessel.

22. What’s in BLOOD digested food red blood cells white blood cells oxygen
waste
platelets
carbon dioxide
hormones
plasma

23. Factors Affecting Blood Flow

24. Blood flow: Amount of blood that flows through any tissue in a given period of time (mL/min)
Blood Pressure (BP): Contraction of the ventricles pushes blood and exerts pressure on the walls of a blood vessel.

25. Blood Flow can be affected by:
Size of the blood vessels
Bigger = more blood flow
Smaller, more narrow = less blood flow
Blood viscosity – the ability for blood to flow through the blood vessel
High viscosity = slower flow (think syrup!)
Happens when blood is filled with high levels of fats, sugars, not enough water, etc.
Low viscosity = fast, easy flow (think water!)
Animation

26. Heart Disease
Atherosclerosis is a condition in which fatty deposits called plaques build up in artery walls, eventually cause the arteries to stiffen and become narrow, restricting blood flow to the body.

27. High Blood Pressure
High blood pressure occurs when the heart struggles to push blood through vessels.
Can lead to heart damage

28. Stroke
The sudden death of brain cells when their blood supply is interrupted is called a stroke.
Some strokes are caused by a blood clot that blocks a blood vessel in the brain.
Animation

29. Circulatory System Kahoot Review!