Lecture 13 Flashcards
What things does blood transport?
Essencial ions and molecules waste products Heat Hormones immune cells
How is immunity a function of the blood?
Blood contains different types of immune factors important for fighting infection and production of immune response
What is coagulation and hoe does blood do it?
Preventing bleeding via platelets and coagulation factors plasma
What is the composition of blood?
Consists of plasma and formed elements
What is the composition of plasma?
Main component is water.
aLso contains proteins, immune response proteins, enzymes, hormones, gasses and ions.
what are formed elements?
Cells and cell fragments
Platelets
White blood cells
Red blood cells
What is Hematopoiesis?
Formation of blood cells
Where does Hematopoiesis occur?
Initiated in red marrow, which contains hemocytoblasts
What are hemocytoblasts?
Progenitors for all blood cells
What does erythropoietin do?
Stimulating chemical that tells hemocytoblasts to produce more red blood cells
Function of Red blood cells/
Highly specialized to transport gasses from areas of high concentration to areas of low concentration
Structure of red blood cells?
Biconcave disc shaped
- large surface area
- allows for efficient diffusion of gases
- flexibility for movement through narrow capillaries
Characteristics of red blood cells?
- Contain large amounts of hemoglobin
- uses iron as part of the heme structure to bind oxygen
- four heme units so each hemoglobin can bind four oxygen molecules
What is the hematocrit or packed cell volume?
The fraction of blood occupied by red blood cells
When blood is centrifuged what are the three colours?
Yellow/off white - plasma and remainder of formed elements
White - Buffy Coat - WBC and platelets
Red - Hematocrit - RBC
