The roles of the blood Flashcards
The component of blood
Plasma
White blood cell
Platelets
Red blood cells
Components of blood & its function: plasma
Transports digested food products, excretory products & chemical messages.
Maintains steady body temperature
Acts as a buffer
Erythrocyte (red blood cells) made in
Bone marrow
Erythrocyte (red blood cells): structure
Contain Hb that carries O2
Erythrocyte (red blood cells): function
Transport 02 from lungs to all cells
Transport some C02 produced in respiration back to the lungs
Erythrocyte (red blood cells): adaptation
Biconcave disc shape - provides large SA/V ratio so oxygen can diffuse rapidly
No nucleus - leaves more space for Hb molecules to carry O2
Leucocyte (white blood cells) made in
Bone marrow
Types of leucocyte (white blood cells)
Granulocytes
Agranulocytes
Both leucocyte contain
Nucleus & colorless cytoplasm
Granulocytes
Some types contain granules which can be stained
Agranulocytes
Do not contain granules
Leucocyte (white blood cells) function:
Defend the body against infection
Plays a role in inflammatory response
Thrombocyte (platelets)
Maegakaryocytes
Made in bone marrow
Thrombocyte (platelets) function:
Involved in blood clotting
Large globular protein consisting of 4 polypeptide chains, each with Fe containing prosthetic group
The first O2 molecule that binds to the Hb changed the arrangement of the molecule making it easier for the following O2 molecules to bind
When the first O2 molecule dissociates Hb changes arrangement of the molecule making it progressively difficult to remove the O2
Partial pressure
It is simply the pressure exerted by a mixture of gases. Measured in kPa
The Bohr effect
At high C02 Hb affinity for 02 decreases so dissociates easily
Curve shifts to right
So in active tissues where C02 is high Hb releases 02 more rapidly
The change in 02 dissociation curve that results as C02 level changes are known as the Bohr effect
