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? Maintains body temperature (homeostasis!) Transports materials around your body Fights infection

What is blood made of? Blood is not just red liquid. It has several components: PLASMA (about ½) BLOOD CELLS (about ½) Red Blood Cells White Blood Cells Platelets PLASMA BLOOD CELLS

What is blood made of? RED BLOOD CELL WHITE BLOOD CELL PLATELETS

What is blood made of? Red Blood Cells (RBCs) carry oxygen to all parts of the body. Sickle cell anemia is a genetic disorder that affects red blood cells. RED BLOOD CELL WHITE BLOOD CELL PLATELETS RED BLOOD CELL WHITE BLOOD CELL PLATELETS

What is blood made of? Platelets form blood clots (to stop bleeding). Certain proteins help platelets clump together at the site of an injury. RED BLOOD CELL WHITE BLOOD CELL PLATELETS RED BLOOD CELL WHITE BLOOD CELL If the proteins are missing, blood can’t clot and the person has hemophilia. PLATELETS

What is blood made of? White blood cells fight infection and are part of the immune system. There are two types of white blood cells: Phagocytes Lymphocytes RED BLOOD CELL WHITE BLOOD CELL PLATELETS RED BLOOD CELL WHITE BLOOD CELL PLATELETS

The Immune system Phagocytes fight infection by “eating” cells they recognize as foreign. Step 4: The phag-ocyte uses chemi-cals to break apart the bacteria. Step 3: The bac-teria is completely surrounded by the phagocyte. Step 1: The phag-ocyte recognizes a bacteria cell. Step 2: The phag-ocyte surrounds the bacteria cell. They mostly only recognize bacteria cells, so the immune system needs more cells to fully protect our bodies.

The Immune system B Cells T Cells 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 5: T cells release chemicals that dissolve the infected cell. Step 4: T cells recognize the anti-bodies and attach to them. Step 1: Infected cells put out a “flag” that is recognized by a B cell. Step 3: Some of the antibodies attach to the infected cell. Step 2: The B cell releases chemicals called antibodies.

The Immune System The leftover antibodies will stay in your body forever, which is why you only get most infections once – your antibodies will immediately respond if they see the same thing again. HIV is a virus that infects the T cells and tricks your body into destroying the very cells that would normally wipe out a virus. Then, your body can’t fight other common infections. RED BLOOD CELL WHITE BLOOD CELL PLATELETS

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!