Transcript Circulatory System:

Circulatory System:
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
Major Parts:
• Heart
• Blood
• Vessels
– Arteries
– Veins
– Capillaries
Minor Parts:
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Lungs
Spleen
Liver
Kidneys
Bone Marrow
Brain
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
Parts of the Heart:
1. Aorta
2. From the body
5. Right atrium
6. One way valvebicuspid
7. Right ventricle
9. From the lungs
11. Left Atrium
12. One Way
Valve- Tricuspid
14. Left ventricle
Sequence of a Heartbeat:
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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.
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
Blood Pressure:
• Systolic- 1st number
– During heart contraction
• Diastolic- 2nd number
– During heart’s rest/refill
– Number that they watch for HBP
Blood
• White blood cells– 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
Healthy Circulatory System:
• Low fat diet
• Avoid being overweight
• Exercise to strengthen heart