Presentation on theme: "BLOOD. Learning Objectives Describe the primary functions' of blood Describe the characteristics of blood Discuss the blood types including Rh factor."— Presentation transcript:
Biconcave discs 5 million per cubic millimeter Lack 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, Basophils Agranulocytes (lacking granular cytoplasm) Monocytes, Lymphocytes
Platelets (thrombocytes) Blood clots and vessel repair
Platelets Platelets and blood clotting Platelets play an essential role in blood clotting Blood clot formation Clotting factors released at the injury site produce prothrombin activator Prothrombin activator and calcium convert prothrombin to thrombin Thrombin triggers formation of fibrin, which traps RBC to form a clot
PLASMA The liquid portion of blood is 92% water Also contains nutrients, gases, vitamins (etc) and plasma proteins
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
HEMOSTASIS The process of stopping bleeding Involves 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 coagulation conversion of fibrinogen to fibrin *thrombin is an enzyme that causes the conversion THREE EVENTS IN HEMOSTASIS
On a cold day in 1667, a renegade physician named Jean Denis transfused calf's blood into one of Paris's most notorious madmen. In doing so, Denis angered not only the elite scientists who had hoped to perform the first animal-to-human transfusions themselves, but also a host of powerful conservatives who believed that the doctor was toying with forces of nature that he did not understand. Just days after the experiment, the madman was dead, and Denis was framed for murder. From: Blood Work: A Tale of Medicine and Murder in the Scientific Revolution Blood Work: A Tale of Medicine and Murder in the Scientific Revolution
1901 - Austrian Karl Landsteiner discovered human blood groups Even animals have blood types
Blood Type is Controlled by 3 Alleles Alleles: A, B, O A & B are codominant O is recessive 4 Possible Blood Types
Rh system Rh-positive blood Rh factor antigen present in RBCs Rh-negative blood No Rh factor present in RBCs No anti-Rh antibodies present naturally in plasma Anti-Rh antibodies appear in the plasma of Rh-negative people if Rh-positive RBCs have been introduced into their bodies
Blood Safety EXAMPLES OF BLOODBORNE PATHOGENS HEPATITIS B (HBV) HEPATITIS C (HCV) Other NON A, NON B HEPATITIS HUMAN IMMUNODEFICIENCY VIRUS (HIV) MALARIA OTHER POTENTIALLY INFECTIOUS MATERIALS
TRANSMISSION HIV, hepatitis B virus, and hepatitis C virus are the viruses most likely to be transmitted via the following routes in an occupational setting: needle stick / sharps injuries skin or eye contact mucous membrane and non-intact skin exposure to contaminated blood or other potentially infectious materials ( scratches, cuts, bites, or wounds )
Avoid Contact With Blood Wear gloves Dispose of items that have been contaminated (tissues, needles, bandaids) in biohazard containers Do not “horse around” Treat every person as if they may be carrying an infectious disease
Carbon Monoxide Poisoning CO binds to your hemoglobin, prevents oxygen from binding. Can be fatal. It is a "silent killer" as people often die in their sleep when a heater fails. Carbon monoxide deaths are more likely to occur in winter Article from 2010, St Clair County
ANEMIA Iron-Deficiency Anemia (most common) Aplastic Anemia – bone marrow does not produce enough RBC Hemorrhagic anemia – due to extreme blood loss Pernicious anemia – B12 deficiency Sickle Cell Anemia (genetic) - blood cells abnormally shaped Polycythemia – too many RBC
SICKLE CELL ANEMIA Genetic Disorder Abnormally shaped blood cells Parents can be carriers (asymptomatic)
Leukemia is one of the most common childhood cancers. It occurs when large numbers of abnormal white blood cells fill the bone marrow and sometimes enter the bloodstream. Because these abnormal blood cells are defective, they don't help protect the body against infection the way normal white blood cells do. And because they grow uncontrollably, they take over the bone marrow and interfere with the body's production of other important types of cells in the bloodstream, like red blood cells (which carry oxygen) and platelets (which help blood to clot). St. Jude Hospital
Infectious mononucleosis sometimes called "mono" or "the kissing disease," is an infection usually caused by the Epstein-Barr virus (EBV). The designation "mononucleosis" refers to an increase in one type of white blood cells (lymphocytes) in the bloodstream relative to the other blood components as a result of the EBV infection. EBV is very common, and many people have been exposed to the virus at some time in childhood. Article at MedicinenetMedicinenet
Blood poisoning - Septicemia An infection enters the blood stream Can be deadly Treated with antibiotics
Thrombocytopenia Low production of Platelets Causing bleeding or bruising A bruise is caused when tiny blood vessels are damaged or broken as the result of a blow to the skin (be it bumping against something or hitting yourself with a hammer). The raised area of a bump or bruise results from blood leaking from these injured blood vessels into the tissues as well as from the body's response to the injury.
Hemophilia - inability or reduced ability of the blood to clot; genetic disorder (more on this later) von Willebrand Disease - also a clotting disorder, but not as severe, excessive bruising occurs
HEMOPHILIA This disorder causes a failure of the blood to clot Patients can be treated with blood transfusions that include clotting agents.
Quick Genetics Review A gene consists of 2 alleles (represented by letters) One allele is usually dominant over the other Example: Genotype Phenotype PP widow’s peak Pp widow’s peak pp straight hairline
A person with a widow's peak (Pp) is married to a person with a straight hairline (pp), what percentage of their children will have a straight hairline?
Two people who are both heterozygous for the widow's peak trait are married. What percentage of their children will have a straight hairline?
Sickle Cell Anemia is actually codominant AA = normal Aa = sickle cell trait (few symptoms) aa = sickle cell anemia
If both parents are carriers, child has a ¼ chance of having the disease
A female has sickle cell anemia and is married to a man who appears normal. A doctor tests the man and determines that he does NOT have sickle cell trait. What is the chance that this couple will have a child with sickle cell anemia?
What happens when a female who is a carrier marries man with sickle cell anemia?
Hemophilia is carried on the X chromosome Females X H X H normal X H X h carrier X h X h hemophiliac Males X H Y normal X h Y hemophiliac
What happens when a female who is a carrier marries a normal man?
What happens when a female who is normal marries a man who has hemophilia?