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Bell Work
• 1. What type of tissue is blood? (epithelial, connective, muscular, or nervous)
• 2. What types of blood cells do we have?
BLOOD
Blood transports substances and maintains homeostasis in the body
Hematophobia= fear of blood
Blood and Blood CellsBlood is a type of CONNECTIVE TISSUE
It has two basic components:
CELLS (rbc, wbc, platelets) = 45%
Plasma (water, proteins, amino acids..etc) = 55%
Hematocrit - volume of blood cells in a sample, should be 45%. The remaining fluid is plasma (55%). To determine the percentages, blood is placed in a centrifuge
Three Types of Blood Cells red blood cells (erythrocytes)white blood cells (leukocytes)platelets (thrombocytes)
Biconcave discs5 million per cubic millimeterLack nuclei
HEMATOPOEISIS – formation of blood cells (bone marrow)
Liver & Spleen - phagocytosis
Main Functions of RBCs
Transports oxygen, picks up carbon dioxide
HEMOGLOBIN - molecule that combines with O2 IRON is critical to synthesize hemoglobin
Oxygen Levels
Oxyhemoglobin = plenty of oxygen; bright red
Deoxyhemoglobin = low in O2, “bluish red”
Elements Critical to RBC Production
• Folic Acid• Vitamin B12• Iron
Too few RBC = anemia
WHITE BLOOD CELLS(Leukocytes)
• General function is to protect the body against disease
• There are FIVE different kinds of WBCs
Granulocytes (granular cytoplasm) Neutrophils, Eosinophils, BasophilsAgranulocytes (lacking granular cytoplasm) Monocytes, Lymphocytes
Neutrophil (nucleus has several lobes)
Active phagocytes60% of WBC
Present in the pus of wounds
Basophil Produces Heparin and Histamines
Important in Inflammatory Reaction
1% WBC
Eosinophil
Mainly attack parasites2% WBC
Monocyte (larger cell, horseshoe shaped nucleus)
Become macro-phages
Lymphocyte(nucleus is dark and takes up almost whole cell; almost no cytoplasm seen)
Defense against invaders
Yield Antibodies30% WBC
Left: Lymphoctye | Right: Neutrophil
Platelets (thrombocytes)
Blood clots and vessel repair
Plasma Proteins
• Albumins – blood pressure• Globulins (alpha, beta, gamma) – transport
lipids and antibodies for immunity• Fibrinogen – important for blood clotting
MAJOR EVENT IN BLOOD CLOTTING =
Fibrinogen converted to FIBRIN
PLASMA
The liquid portion of blood is 92% water
Also contains nutrients, gases, vitamins (etc) and plasma proteins
This machine removes the plasma from the blood and returns the RBC’s to the donor.
HEMOSTASIS
The process of stopping bleedingInvolves the coagulation and clotting of the blood to seal the site of damage
1. Blood Vessel Spasm Seratonin = vasoconstrictor 2. Platelet plug formation 3. Blood coagulationconversion of fibrinogen to fibrin
*thrombin is an enzyme that causes the conversion
THREE EVENTS IN HEMOSTASIS
Hemostasis
Blood Clot Formation Animated(Video)
2D animation Medivisual
COAGULATION - the thickening of blood to form a clot (hematoma)
THROMBUS – blood clot (abnormal)
EMBOLUS – when the clot moves to another place.
What is DVT? Video: Deep Vein Thrombosis
What is a Pulmonary Embolism?
Video: Pulmonary Embolism