Circulatory System:

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
• During heart contraction
• Diastolic- 2nd number
• During hearts rest/refill
• Number that they watch for HBP

9
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

10
Healthy Circulatory System

• Low fat diet
• Avoid being overweight
• Exercise to strengthen heart