1. Jason GodoBiology 120 Chapter 2 Assignment Hematic System 1/22/2012

2. Structures of the Hematic SystemPlasmaErythrocytesLeukocytesPlateletsCopyright: Texas Heart Institute 3. Structures of the Hematic System Plasma The liquid part of blood or lymph Erythrocytes Red Blood Cells Leukocytes White Blood Cells Platelets Cells that aid in coagulationCopyright: Texas Heart Institute 4. Functions of the Hematic SystemTransport oxygenProtect against pathogensControl bleeding 5. Transport oxygen 6. Protect against pathogensThe body has differentways of protecting itselfagainstpathogens. White bloodcells help to defend usagainst pathogenswhich may have enteredthe body. They protectus in the following ways:by ingesting thepathogensby producingantibodies whichdestroy particularbacteria or virusesby producingCopyright: Dr. Parrys Websiteantitoxins which actagainst the toxinsproduced by pathogens. 7. Control bleedingPlatelets are small discshaped cells that are foundthroughout theblood. Platelets start therepair of injured bloodvessels. First, plateletsclump together and stick tothe wall of the injured bloodvessel. Then, a fibrin net isformed over theplatelets. These stepsdescribe how a blood clot isformed.