Circulatory System Heart Blood Blood vessels
Circulatory System <ul><li>Simple animals (sponge, hydra) have no circulatory system </li></ul><ul><li>Complex animals hav...
Types of circulatory systems
The Human Heart <ul><li>The heart is a muscle </li></ul><ul><li>It pumps blood through the body </li></ul><ul><li>There ar...
Pumping of the Heart <ul><li>Heart pumps 60-80 times a minute while you are resting </li></ul><ul><li>May pump up to 150 t...
Heart Valves <ul><li>For a pump to work right the liquid must go only in one direction </li></ul><ul><li>Valves are flaps ...
Heart Valves (cont.) <ul><li>The other valves are the semilunar valves between the ventricles and their arteries. </li></u...
Jobs of the Circulatory system <ul><li>Main job is to pump oxygen from your lungs to the body </li></ul><ul><li>Right side...
Exchange of gasses in the lungs
More jobs <ul><li>Gets nutrients from the gastric system and distributes to the tissues </li></ul><ul><li>Gets wastes from...
 
Blood Vessels <ul><li>You have about 96,000 Kilometers of blood vessels in your body (2.5 times around the world) </li></u...
Arteries <ul><li>Carry blood away from the heart </li></ul><ul><li>Carry blood under high pressure </li></ul><ul><li>Round...
Veins <ul><li>Carry blood to the heart </li></ul><ul><li>Carry blood under low blood pressure </li></ul><ul><li>They are f...
Capillaries <ul><li>Are very small and only one cell thick </li></ul><ul><li>Some blood cells can pass between the cells o...
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Heart & circulatory

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Heart & circulatory

  1. 1. Circulatory System Heart Blood Blood vessels
  2. 2. Circulatory System <ul><li>Simple animals (sponge, hydra) have no circulatory system </li></ul><ul><li>Complex animals have circulatory systems that are either: </li></ul><ul><li>Open – blood circulates inside the body without blood vessels </li></ul><ul><li>Closed – blood is inside vessels </li></ul><ul><li>Humans have a closed system </li></ul>
  3. 3. Types of circulatory systems
  4. 4. The Human Heart <ul><li>The heart is a muscle </li></ul><ul><li>It pumps blood through the body </li></ul><ul><li>There are upper and lower chambers on the two sides of the heart </li></ul><ul><li>The upper are called atria </li></ul><ul><li>The lower are called ventricles </li></ul>
  5. 5. Pumping of the Heart <ul><li>Heart pumps 60-80 times a minute while you are resting </li></ul><ul><li>May pump up to 150 times a minute after running </li></ul><ul><li>Will pump more than 2 billion times in your lifetime </li></ul>
  6. 6. Heart Valves <ul><li>For a pump to work right the liquid must go only in one direction </li></ul><ul><li>Valves are flaps in the heart that keep blood flowing in one direction </li></ul><ul><li>The tricuspid valve is between the right atrium and the right ventricle </li></ul><ul><li>The bicuspid valve is between the left atrium and the left ventricle </li></ul>
  7. 7. Heart Valves (cont.) <ul><li>The other valves are the semilunar valves between the ventricles and their arteries. </li></ul><ul><li>If you listen to your heart you are hearing the main valves closing </li></ul>
  8. 8. Jobs of the Circulatory system <ul><li>Main job is to pump oxygen from your lungs to the body </li></ul><ul><li>Right side of your heart pumps blood through the lungs </li></ul><ul><li>Blood from the lungs is pumped by the left side to all the parts of the body </li></ul><ul><li>Blood coming back from the body parts goes into the right side </li></ul>
  9. 9. Exchange of gasses in the lungs
  10. 10. More jobs <ul><li>Gets nutrients from the gastric system and distributes to the tissues </li></ul><ul><li>Gets wastes from the tissues and takes them to the lungs (CO2) and kidneys (waste chemicals) </li></ul><ul><li>Helps regulate temperature of the body </li></ul><ul><ul><li>More blood to the skin to lower temp </li></ul></ul><ul><ul><li>Less blood to the skin to raise temp </li></ul></ul>
  11. 12. Blood Vessels <ul><li>You have about 96,000 Kilometers of blood vessels in your body (2.5 times around the world) </li></ul><ul><li>Three types of blood vessel </li></ul><ul><ul><li>Arteries – away from heart </li></ul></ul><ul><ul><li>Capillaries – very small, one cell thick </li></ul></ul><ul><ul><li>Veins – back to heart </li></ul></ul>
  12. 13. Arteries <ul><li>Carry blood away from the heart </li></ul><ul><li>Carry blood under high pressure </li></ul><ul><li>Round in shape and have thick, muscular walls </li></ul>
  13. 14. Veins <ul><li>Carry blood to the heart </li></ul><ul><li>Carry blood under low blood pressure </li></ul><ul><li>They are flat in shape and have little muscle </li></ul><ul><li>They have one-way valves to keep blood flowing in one direction </li></ul>
  14. 15. Capillaries <ul><li>Are very small and only one cell thick </li></ul><ul><li>Some blood cells can pass between the cells of the capillary wall </li></ul><ul><li>All the pickups (Carbon dioxide and waste) and deliveries (Oxygen and nutrients) occur in the capillaries </li></ul>

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