Ch 19.1 Notes

Circulatory System

Go with the Flow!What is the circulatory system?

• Includes 2 Systems1. Cardiovascular system 2. Lymphatic system.

• Both systems move fluids around the body and protect it from disease.

•Heart = 4 chambered muscular pump

•Blood = clear fluid (plasma) that carries blood cells,

platelets, nutrients, and gases (O2 and CO2) through the body

•Blood vessels = arteries, veins, capillaries carry blood through body

• The cardiovascular system is a closed-loop system.

Cardiovascular system

•Group of organs and tissues - collect fluid that leaks from blood …called Lymph… and returns it to the blood•Lymph vessels have 1-way valves to keep lymph from flowing backwards

•The lymphatic system is an open-loop system

Lymphatic system

How do the systems work together?

• As the heart pumps, fluid leaks out through capillaries

• Lymph capillaries absorb the extra fluid not reabsorbed by the capillaries

Turn to your partner and review – 3 minutes -

• Which two systems make up the circulatory system?

• List and Describe the key parts to each system.

• How do these two systems work together?• What do veins and lymph vessels have in

common?• What is meant by a “closed-loop” and “open-

loop” system?

O2 O2

Septum = muscular wall that separates the left and right sides of the heart. Why is that important?

• Right side of the heart pumps

oxygen-poor blood to

the lungs.

• Left side of the heart pumps

oxygen-rich blood

to the body.

The Heart of the Matter

Think!! Review with your partner!• How many chambers are in the heart? Name

them!• Which side of the heart handles oxygen poor

blood? Oxygen rich?• What is the importance of the septum?

2 upper chambers of the heart Right atrium Left atrium

Chambers in Heart

RA LA

RV2 lower chambers• Right Ventricle• Left Ventricle

LV

Blood Vessel Artery

moves blood AWAY

from the heart

under high pressure - thick walls

Blood Vessel Vein

moves blood TOWARDSthe heart

1 –way valves keep blood from flowing backwards

Blood Vessel

CapillariesSMALLEST blood vessels… connect arteries and veinsAllows exchanges between body cells and blood!

Let’s review the three types of blood vessels!

• An artery … carries blood …

• A capillary … smallest blood vessel that …

• A vein … carries blood …

Think! Turn to your partner and review

1. ________system-blood flow within tissues of heart

2. _________ Circulation - blood flow through the heart to the lungs and back to heart

3. ________ Circulation – blood flow from the heart to the body and back to the body (except the lungs)

Coronary

Pulmonary

Systemic

Circulatory System – divided into 3 sections

Circulatory Song…sit back and enjoy

http://www.youtube.com/watch?v=q0s-1MC1hcE

Functions of Blood1. Carries _______ from your lungs to your body

cells and carries_____________ as waste from your cells to your lungs to be exhaled.

2. Carries ____________ from your cells to your kidneys to be removed.

3. Transports ________ to your body’s cells.4. Fight ________ and heal wounds.

oxygen

waste products

nutrients

infections

carbon dioxide

Parts of Blood1. Plasma - _________ part of blood

a. _________, minerals, and oxygen are dissolved in plasma

b. Carries wastes from __________2. _______________ supply your body with oxygen.

a. Contain ___________ - chemical that can carry O2

and CO23. Life span is _____ days, and they are rapidly replaced

4. ______________ fight pathogens5. ____________ - cell fragments that help clot blood.

Clear liquidNutrients

cellsRed blood cells

hemoglobin

120White blood cells

Platelets

Review Questions for Ch 191. The _______carries blood back to the heart.2. The ___________ transports tissue fluid through a network of

vessels.3. _______ is the chemical in red blood cells that picks up oxygen

molecules.4. ___________ are cell fragments that help clot blood.5. The smallest blood vessels are called ________.6. The flow of blood to an from the lungs is called

_________________.7. ______________ helps protect your body against infection.8. The largest section of the circulatory system is the_______9. _________ are blood vessels that carry blood away from the

heart.10. The two lower chambers of the heart are called the left and right

__________, and the upper chambers are called _______.

Review Questions continued11. Where does the exchange of food, oxygen, and

wastes occur in the circulatory system?12. Where does oxygen rich blood enter first?13. What is circulation to all parts of the body called?14. What is the main function of blood?16. Which cell in the blood fights infection?17. Which cell in the blood is responsible for carrying

oxygen?18. What is required to clot blood?19. What is the general function of the lymph system?