1. Circulatory System:

2. Function: TRANSPORT SYSTEM: To deliver oxygen and food
Collects waste products for removal
Helps defend the body against infection
Filters dead blood cells from body

3. Major Parts: Minor Parts:
Heart
Blood
Vessels
Arteries
Veins
Capillaries
Lungs
Spleen
Liver
Kidneys
Bone Marrow
Brain

4. Heart: General Info: Size of fist 50% muscle tissue
Protected by ribcage
Pumps 70 times per minute when at rest
Pumps 70ml per beat
4 stages to a heartbeat
4 chambers to a heart (2 halves / by septum)
One way valves (bicuspid or tricuspid)
Natural pacemaker to make muscle contract
Made of cardiac muscle

5. Parts of the Heart: 1. Aorta 2. From the body 5. Right atrium
6. One way valve-bicuspid
7. Right ventricle
9. From the lungs
11. Left Atrium
12. One Way Valve- Tricuspid
14. Left ventricle

6. Sequence of a Heartbeat:
Blood is coming from the body and carrying carbon dioxide.
This blood enters the right atria.
One-way valve in the bottom of the right atrium opens.
The one-way valves close.
The blood moves from the right atrium moves into the right ventricle.
The right ventricle pumps the blood to the pulmonary artery.
This artery carries the carbon dioxide-rich blood to the two lungs.
Blood travels to the lungs where gas exchange takes place.
Blood returns from the lungs and is rich with oxygen.
This blood enters the left atria.
One-way valve in the bottom of the left atrium opens.
One-way valve closes.
Blood is trapped in the left ventricle.
The left ventricle pumps blood into the aorta.
This is the largest artery in the body and carries the blood to the body.

7. Blood Vessels:
Arteries- large blood vessels that carry blood away from the heart
Flexible for the pumping
Aorta is largest artery
Veins- vessels that return blood to the heart
Contain one-way valves
Capillaries- smallest vessels where gas exchange occurs

8. Blood Pressure: Systolic- 1st number Diastolic- 2nd number
During heart contraction
Diastolic- 2nd number
During heart’s rest/refill
Number that they watch for HBP

9. Blood White blood cells- Red Blood Cells Plasma - mostly water (90%)
Larger
Main defense against germs
Multiple types
Red Blood Cells
Very small
Carries oxygen via hemoglobin
Created & filtered via spleen, bone marrow, & liver
Plasma - mostly water (90%)
Nutrients
Hormones
Minerals
Platelets - allow for clotting

10. Healthy Circulatory System:
Low fat diet
Avoid being overweight
Exercise to strengthen heart