Histo 3 Flashcards
(33 cards)
Blood
a fluid connective tissue that circulates through the cardiovascular system.
Total blood volume in the average adult is
about 6 L
or 7% to 8% of total body weight.
plasma
a extracellular component of blood which is protein rich fluid
erythrocytes
red blood cells (RBCs)
thrombocytes
Platelets
Blood’s many functions
Delivery
Maintenance of homeostasis
Transport
coagulation and thermoregulation
Blood delivers:
- nutrients and oxygen directly or indirectly to cells.
2. hormones and other regulatory substances to and from cells and tissues
What does blood transport
wastes and carbon dioxide away from cells
humoral agents and cells of the immune system that protect the body
How does blood maintain homeostasis
by acting as a buffer
extracellular material that imparts fluid properties to blood.
Plasma
Cells and plasms percentage
45%
55%
volume of packed erythrocytes in a sample of blood is called the
hematocrit
Leukocytes and platelets constitute only …% of the blood volume.
1
The leukocytes and platelets are contained in a narrow layer at the upper part of the cell fraction called
buffy coat
Range of blood cells
200,000-400,000 platelets
5000-9000 leukocytes
5,000,000-10,000,000 erythrocytes
More than 90% of plasma by weight is
water
Why is water important in plasma
Because it serves as the solvent for a variety of solutes
The solutes in the plasma help maintain
homeostasis
Plasma proteins consist primarily of
albumin, globulins, and fibrinogen.
main protein constituent of the plasma
Albumin
smallest plasma protein
Albumin
70 kilodalton
Albumin is made in
Liver
Albumin function
exerting the concentration gradient between blood and extracellular tissue fluid.
What maintains the correct proportion of blood to tissue fluid volume?
colloid osmotic pressure
