Heart And Circulatory System Flashcards
What is Blood Plasma?
A yellowish coloured liquid component of bloo that normally holds the blood cells in whole blood in suspension.
What does Blood Plasma do?
Transports all of your blood cells and other substances around your body.
What is in Blood Plasma?
Small,soluble products of digestion pass into the plasma from your small intestine and are transported into individual cells.
What do Red Blood Cells do?
These cells pick up oxygen from the air in your lungs and carry it to cells where it is needed.
What do Red Blood cells look like?
Biconcave discs, being (pushed in) on both sides gives them an increased surface area to volume ratio for diffusion.
The structure of Red Blood Cells:
They are packed with a red pigment called haemoglobin that binds to oxygen
They have no nucleus, making space for haemoglobin.
What do White Blood Cells do?
Much bigger than red blood cells but fewer of them.
They have a nucleus and form part of the body’s defence system against harmful microorganisms.
What do White Blood Cells do:
White blood cells (lymphocytes) form antibodies against microorganisms, some form antitoxins againts poisons; yet others engulf and digest invading bacteria and viruses.
What are Platelets?
Small fragments of cells
What are Platelets like?
No nucleus
What do Platelets do?
Help blood clot at the site of a wound, blood clotting is a series if enzyme-controlled reactions that result in converting fibrinogen into fibre.
Double Circulatory system:
The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates,One is oxygenated and the other is deoxygenated but a lot of carbon dioxide.
