Blood 1 Flashcards
What are the 3 main functions of the blood?
Transport, Defense, Homeostasis
How much of the body is blood?
7 or 8% of body weight it blood
What affects the flow of blood?
The viscosity of blood
What is the Hematocrit?
The percentage of the total blood volume that is occupied by red blood cells that have been packed down due to gravity or the centrifugal force
What are the different Hematocrit values in men and women?
45 +/-5 in women
47 +/-5 in men
What is the Buffy Coat?
The thin layer above RBCs after centrifuging blood
What does the Buffy Coat contain?
White blood cells and platelets
What is Plasma?
The fluid portion of the blood
What is the Plasma of the blood apart of?
The body’s extracellular fluid
Where is Intracellular fluid found?
Inside the cells
Aside from Plasma, what is the other part of the body’s extracellular fluid?
Interstitial fluid
Where is Interstitial fluid found?
Outside the blood vessels, outside cells
What is the main component of plasma?
Mainly water (>90%)
What electrolytes does plasma contain?
Na+ and Cl-
What are some things that the Plasma transports?
Nutrients, waste products, hormones, CO2
What do Plasma proteins have a role in?
- Distribution of body water
- Buffering
- Transport
- Defence
- Homeostasis
How is most of the oxygen in the blood transported?
By red blood cells with 2% being transported by plasma
What are three main groups of Plasma proteins?
Globulins, Albumin and Fibrinogen
What does Fibrinogen have a crucial role in?
Preventing blood loss
What protein class do antibodies belong to?
Immunoglobulins
What can water move between?
It can move in and out of blood vessels, inside tissues, and from blood vessels to tissues and vice versa
What is the movement of water across the wall of a blood vessel dependant on?
The Osmotic gradient across that blood vessel wall and plasma proteins
How do less plasma proteins affect water movement?
If the concentration of plasma proteins go down, less water will move into the blood vessel
What can act as buffers?
Plasma proteins
How can plasma proteins affect hormones?
Proteins in the plasma can bind to molecules such as hormones and carry them through the blood
