Blood. Chapter 9 Section 1. 1. Functions of Blood. carries oxygen from lungs to body cells and carries carbon dioxide to lungs to be exhaled carries waste products from cells to kidneys transports nutrients and other substances to body cells
3. Plasma– liquid part of blood made up mostly of water. Nutrients, minerals, and oxygen are dissolved here. Wastes are carried away in the plasma
4. White blood cells – cells that destroy bacteria, viruses, and foreign substances; life span varies from a few days to many months
5. Red blood cells – they contain hemoglobin. Oxygen and carbon dioxide attaches to the hemoglobin, and is carried throughout the body. Lifespan of about 120 days.
6. Platelets– help stop bleeding by clotting; lifespan of about 5 to 9 days.
1. Platelets and clotting factors in your blood make a blood clot that plugs the wounded blood vessels
2. Platelets stick to the wound and fibrin creates a threadlike, sticky net to trap blood cells and plasma to form a clot
3. The clot hardens to form a scab
4. Under the scab, skin cells begin repairing underneath
5. Bacteria that get under the wound during healing are usually destroyed by white blood cells