blood blood Blood is a fluid connective tissue
blood
• • • blood Blood is a fluid connective tissue. Remember, a tissue is a group of cells that all have the same job. What does our blood do for us? Transports materials around your body Fights infection Maintains body temperature (homeostasis!)
What is blood made of? PLASMA BLOOD CELLS • Blood is not just red liquid. • It has several components: – PLASMA (about ½) – BLOOD CELLS (about ½) – Red Blood Cells – White Blood Cells – Platelets
What is blood made of? RED BLOOD CELL WHITE BLOOD CELL PLATELETS
What is blood made of? RED BLOOD CELL WHITE BLOOD CELL PLATELETS • Red Blood Cells (RBCs) carry oxygen. RED to. BLOOD all parts CELL of the body. • Sickle cell anemia WHITE CELL is BLOOD a genetic disorder that affects red blood PLATELETS cells.
What is blood made of? RED BLOOD CELL WHITE BLOOD CELL PLATELETS • Platelets form blood clots (to stop RED BLOOD bleeding). CELL • Certain proteins help platelets WHITEclump BLOOD CELL together at the site of an injury. PLATELETS • If the proteins are missing, blood can’t clot and the person has hemophilia.
What is blood made of? RED BLOOD CELL WHITE BLOOD CELL PLATELETS • White blood cells fight infection and RED BLOOD CELL are part of the immune system. WHITE • There are two types BLOOD CELL of white blood cells: – Phagocytes PLATELETS – Lymphocytes
The Immune system • Phagocytes fight infection by “eating” cells they recognize as foreign. Step 4: 3: The phagbac. Step 1: The 2: phag. The phagteria isuses ocyte completely chemiocyte recognizes surrounds a surrounded cals to breakbyapart the bacteria cell. phagocyte. the bacteria. • They mostly only recognize bacteria cells, so the immune system needs more cells to fully protect our bodies.
The Immune system • Lymphocytes are the second type of white blood cells. There are two types: B Cells T Cells • Act like spies for the immune system. • Act like soldiers for the immune system
The Immune system • Here’s how it works: Step 4: T cells 5: Step 1: Infected Step 3: Some of the Step 2: The B cell recognize the antirelease chemicals put out a “flag” that antibodies attach to is releases chemicals bodies and attach to that dissolve the recognized by a B cell. the infected cell. called antibodies. them. infected cell.
The Immune System • The leftover antibodies will stay in your body forever, which is why you. RED only get BLOOD CELL most infections once – your antibodies will immediately respond if they see the same WHITE thing again. BLOOD CELL • HIV is a virus that infects the T cells and tricks your body into destroying the very PLATELETS cells that would normally wipe out a virus. Then, your body can’t fight other common infections.
Fun Facts about Blood • About 7% of your body weight is BLOOD. • An average adult body contains about 4 -6 LITERS of blood (that’s 2 -3 large soda bottles). • Average life span of 1 blood cell is 120 days. • Donating 1 pint of blood can save 4 lives! • Blood is such a good stain that Native Americans used it for paint!
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