Blood Blood Components Blood contains formed elements 1
Blood
Blood Components ¡Blood contains “formed elements” ¡ 1. Red Blood Cells ¡ 2. White Bloods cells ¡ 3. Platelets ¡The liquid that makes up the rest of the blood is called “plasma”
Blood after Centrifugation Plasma Formed Elements
FORMED ELEMENTS ¡ 1. Red Blood Cells (RBC) ¡Description ¡ 4 -6 billion in 1 m. L of blood ¡Red-coloured ¡Shape of biconcave disks
Red Blood cells (continued) ¡Have HEMOGLOBIN, which will bind with O 2 and CO 2 and transport it throughout the body. ¡This is what makes blood RED.
Red Blood cells (continued) ¡They do not have a nucleus, so the cell cannot divide ¡New cells are produced in the BONE MARROW. They are replaced every 120 days.
2. White Blood Cells ¡Also called Leucocytes ¡Are colourless ¡Larger than red blood cells ¡Have a nucleus (so they CAN divide) ¡< 1% of blood volume
Function (WBC) ¡Defend against disease
How? ¡ 1. PHAGOCYTOSIS – Ingest and destroy invaders
¡ 2. Production of ANTIBODIES ¡WBC produces and secretes the proper ANTIBODY ¡Antibody fights invading organism neutralizes it
1. Phagocytosis
3. Platelets ¡< 1% of blood ¡Irregular shaped ¡No nucleus ¡Live up to 10 days
3. Platelets ¡Clot blood by forming a scab – travel to injured area to stop bleeding ¡When not bleeding, platelets circulate in blood
4. Plasma ¡Description ¡Yellowish LIQUID ¡ 90% water ¡Nutrients, antibodies, hormones and waste are dissolved in plasma
4. Plasma ¡Function ¡Gives blood fluidity ¡Transports formed elements, nutrients, antibodies, hormones and waste
¡Blood is a HOMOGENEOUS mixture of these components
Homogeneous Mixture ¡Different substances cannot be distinguished with naked eye ¡Colloid – using a microscope, 2 or more substances can be distinguished
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