1. Circulatory System 7.12B

2. Circulatory System Is a network in our bodies, similar to a highway. Transports nutrients and oxygen to the body BUT HOW???

3. Circulatory System Is made up of…. 1. Heart 2. Blood vessels 3. Blood

4. Heart The heart is a hollow, muscular organ that pumps blood throughout the body. Our heart is a necessity! Every time our heart beats it pushes or transports blood through blood vessels. Is a Cardiac Muscle and has 4 chambers

5. Blood Vessels This is the “highway” our blood travels through They are called ARTERIES, CAPILLARIES, and VEINS.

6. Arteries Transport blood to our ORGANS, INTESTINES, and BRAIN and AWAY from your HEART. Arteries are made up of three layers – Epithelial tissue – Smooth muscle – Connective tissue Need strength and flexibility.

7. Capillaries Materials are exchanged between the blood and the body’s cells. Capillary walls are only one cell thick Pass oxygen and glucose through a process called diffusion. Move materials from a high concentration to a low concentration.

8. Veins Last stop! Also have three layers…but are thinner than arteries. Larger veins have valves that help keep the blood from flowing backward.

9. Pulse Touch your wrist… you can feel the artery in rise up and down…this is your pulse. You determine how fast your pulse is pumping through your heart rate. Your pulse can also be called your blood pressure. Your blood pumping is an involuntary action.

10. Blood Blood is what is pumped through our body’s “highway” Blood is made up of four components – 1. plasma – 2. platelets – 3. red blood cells – 4. white blood cells

11. Plasma Yellowish liquid Carries molecules that aid in digestion Also carry vitamins and minerals Carry away waste products 3 groups of plasma proteins – 1. regulates the amount water in the blood – 2.helps fight disease – 3. interacts with platelets to form blood clots.

12. Platelets Fragments that play a role in forming blood clots. Platelets are what stick to the sight of a wound. When platelets are released they start a chemical reaction…producing a protein called fibrin. Fibrin weaves a tiny net that forms a blood clot. A scab is the hardened end result.

13. Red Blood Cells Carry the oxygen from your lungs and deliver it to the rest of your body. Made of hemoglobin, which is an iron- containing protein that binds chemically to oxygen molecules. This is what causes your blood to be bright red Without oxygen they are dark red.

14. White Blood Cells Disease fighters They recognize intruders and alert the rest of the body. Some notify, some fight, and some produce the chemicals they use to fight off the invaders.

15. Red vs. White They are both made in our bone marrow There are many many more red blood cells than there are white blood cells White blood cells are also bigger than red blood cells.

16. Blood Types A, B, AB, O You must have the same blood types in order to have a successful blood transfusion.