1. Circulatory System

2. Circulatory System
The function of the circulatory system is to move materials around the body
Gases, nutrients, wastes, hormones, etc.
The circulatory system is composed of
Blood - fluid that carries stuff
Vessels - a place for the blood to travel
Pump - the heart pushes the blood through the vessels

3. The Heart Made of muscle 4 chambers Right atrium Right ventricle
Receives oxygen-poor blood from body
Right ventricle
Sends oxygen-poor blood out to lungs
Left atrium
Receives oxygen rich blood from lungs
Left ventricle
Sends oxygen rich blood out to rest of body

4. The Heart Valves Septum
Prevent blood from flowing backwards when the heart relaxes
Septum
Wall between right and left side of heart
Prevents oxygen-poor blood from mixing with oxygen-rich blood

5. The Heart Oxygen poor blood enters heart from body into right atrium
Oxygen poor blood then moves into right ventricle
Oxygen poor blood then moves out of right ventricle and goes to the lungs
Blood picks up oxygen at the lungs
Oxygen rich blood then goes back to the heart and enters the left atrium
Oxygen rich blood moves into the left ventricle
Oxygen rich blood then moves out of the left ventricle and goes out to the rest of the body
In the rest of the body, blood drops off oxygen and picks up carbon dioxide and wastes
The oxygen poor blood then returns to the heart

6. The Heart Pulmonary circulation Systemic circulation
Blood moving from heart to the lungs and back to the heart
Systemic circulation
Blood moving from the heart and to the rest of the body and back to the heart
Having these 2 circulations keeps the blood under HIGH pressure

7. The Heart
The heart muscle contains its own pacemaker (SA node) that tells the heart when to beat
The right and left atria contract first
Pushes blood into ventricles
Then the ventricles contract
Pushes blood out to lungs and to the rest of the body

8. Blood vessels Arteries Carry blood away from heart
Thick muscular walls squeezes the blood through
Veins
Carry blood to heart
Thin walls but have valves to keep blood from flowing backwards
Capillaries
Connect arteries to veins
Where oxygen and nutrients are dropped off and wastes are picked up
Very thin walls
Pass very close to all of the cells in your body

9. Blood pressure The force of blood on the walls of your arteries
Blood pressure is given with two numbers
Normal is 120/80
The first number is the systolic pressure
Pressure when the ventricles CONTRACT
The second number is the diastolic pressure
Pressure when the ventricles relax

10. Circulatory System Problems
High blood pressure
Weakness the heart and blood vessels
Increases risk for heart attack and stroke
Atherosclerosis
Plaque buildup on walls of arteries
Can lead to heart attack or stroke
Statistics
Half of us will die from cardiovascular disease
Prevention
Diet, exercise, no smoking

11. Blood Blood is the fluid that transports stuff around your body
Has 4 parts
Plasma
Mostly water
Contains gases, nutrients, hormones, wastes, etc.
Red blood cells
These are the cells that carry oxygen
Hemoglobin is the protein in RBCs that grabs on to oxygen
White blood cells
Fight infection
Platelets
Involved in clotting

12. The kidneys and liver Kidneys Liver All blood goes through the kidneys
Many dangerous wastes are removed there
Excreted in the form of urine
Salt and water balance is maintained by the kidneys
Liver
All blood goes through the liver
The liver processes or stores nutrients
The liver cells also detoxify the blood