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Objective: SWBAT describe how to screen for the presence of human blood

Do Now 1. Update your exit ticket tracker. 2. How can blood be used as class evidence? 3. Describe the make up of blood . Objective: SWBAT describe how to screen for the presence of human blood. Announcements. Bring gloves for handling blood Notebook check Thursday . Blood Typing.

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Objective: SWBAT describe how to screen for the presence of human blood

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  1. Do Now1. Update your exit ticket tracker.2. How can blood be used as class evidence?3. Describe the make up of blood. Objective: SWBAT describe how to screen for the presence of human blood

  2. Announcements • Bring gloves for handling blood • Notebook check Thursday

  3. Blood Typing • Is a way to identify and match blood samples Types: A : AA AO B : BB BO AB : AB O : OO

  4. Composition of Blood • Plasma : liquid part of blood contains vitamins and proteins • RBC: Carries oxygen to your cells • WBC: immune system • Platelets: help in blood clotting

  5. Antigen and Antibodies • Antigen – a protein that instigate immune reactions • Antibody- proteins that will destroy harmful toxins

  6. O A B AB

  7. Positive or Negative • Rhesus Positive or Rhesus Negative • Rh + Rh – Protein in your blood similar to an antigen If you have the Rhesus protein , you are Rh + If the Rhesus protein is absent, you are Rh -

  8. Rh +  Can receive + or - Rh -  Can only receive -

  9. Recap • Useful • Composition • Blood Types • Antigens and Antibodies

  10. Identifying Blood • Is it blood? • Is it human blood? • Whose blood is it?

  11. What type of test would we run to figure out if blood is present?

  12. What type of test would we run to figure out if blood is present? • Kastle-Meyer Test • Water: used to pick up the stain • Alcohol: increase the sensitivity of the test. by “cleaning up” the area in and around the bloodstain to better expose the hemoglobin. • Phenolphthalein: This is a solution which acts as a color indicator. When this solution is oxidized (exposed to oxygen), it will turn pink. • Hydrogen Peroxide: water with an extra oxygen atom attached to it.

  13. Exit Ticket • 1. What type of test is used to determine if blood is present? • A. Presumptive • B. Confirmatory • C. blood type test • 2. What is a Kastle-Meyer test? • 3. What are the 4 components of blood?

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