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 made in
Bone marrow
Erythrocyte
Contain Hb that carries O2
Erythrocyte: function
Transport 02 from lungs to all cells
Transport some C02 produced in respiration back to the lungs
erythrocyte: 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
Leucocyte made in
Bone marrow
Types of leucocyte
Granulocytes
Agranulocytes
Both leucocyte contain
Nucleus & colorless cytoplasm
Granulocytes
Some types contain granules which can be stained
Agranulocytes
Leucocyte function:
Defend the body against infection
Plays a role in inflammatory response
Thrombocyte
Thrombocyte function:
Involved in blood clotting
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
Myoglobin
Myoglobin is found in muscles. They have a similar structure to haemoglobin but with only one haem group. It has a higher affinity for 02 than normal haemoglobin
