*Introduction to the blood system Flashcards
define blood
a liquid that fills the vascular compartment and serves to transport dissolved materials and blood cells throughout the body
what % of the total blood volume is plasma?
~55
what % of the total blood volume is wbc and platelets?
<1%
what % of the total blood volume is rbc?
~45%
how much blood does the average human have?
4-6 litres
what are the 7 functions of blood?
- respiration
- transport nutrients
- remove waste
- messages (such as hormones)
- protection from infection
- repair tissue damage
- thermoregulation
where does circulation divert blood in extreme heat?
(what are the other methods)
to the surface to cool the body
(sweating)
where does the circulation divert blood in the extreme cold?
(what are the other methods)
deep/core to maintain body heat
(hair and shivering)
how many rbc are there per µl?
5-6 million
how many wbc are there per µl?
5,000-10,000
how many platelets are there per µl?
250,000- 400,000
what is the formation of blood called?
haematopoiesis
where does haematopoiesis occur?
bone marrow
where is red marrow found and what type of blood cell is produced there?
flat bone
red blood cells
where is yellow marrow found and what type of blood cell is produced there?
long bones
some white blood cells