The blood Flashcards
what does the human circulatory system occur of (3)
blood, blood vessels, heart
functions of blood include (3)
transporting waste products, delivering oxygen and nutrients to lungs and tissues, clotting to prevent blood loss
the components of blood
based off liquid called plasma and it carries: red blood cells, white blood cells, platelets
what is blood
a tissue
what adaptations do red blood cells have
biconcave discs
packed with red pigment
no nucleus
what does no nucleus in red blood cell mean in terms of how its specialised to carry out job
more space for haemoglobin
what does biconcave disks adapt mean in red blood cells in terms of how its specialised to carry out job
increased surface area to volume ratio
what does lots haemoglobin mean in red blood cells in terms of how its specialised to carry out job
binds to oxygen
equation for oxygen and haemoglobin
haemoglobin + oxygen → oxyhaemoglobin → haemoglobin + oxygen
no white blood cells have a nucleus and why or why not
instructions so white blood cells can do their job
what do white blood cells form
part of the body’s defence system against nasty microorganisms
what are platelets
small fragments of cells
what do platelets do
help blood clot at the site of a wound
what is blood clotting
series of enzyme-controlled reactions that result in converting fibrinogen into fibrin
describe process of scabbing
- produces a network of protein fibres that capture lots of red blood cells and more platelets to form a jelly-like clot that stops you from bleeding to death
- clot dries and hardens to form a scab
- protects the new skin as it grown and stops bacteria entering the body through the wound
