Blood Flashcards
How many litres of blood do humans have?
Around 5 litres.
Red blood cells are also called…
erythrocytes.
The red blood cells in a fetus are formed in…
in the liver.
When the human is born, the erythrocytes are produced…
by the bone marrow, first in all bones. When adult only in short and flat bones.
The membranes of erythrocytes become more…
fragile and eventually rupture, usually inside the spleen. They live around 20 days.
The red blood cells are shaped like…
biconcave disk, which increases the surface area faster diffusion of oxygen.
The red blood cell has a diameter around…
7micro meters.
The red blood cells are very small, so…
that haemoglobin molecules are close to the surface for exchange. Also, their small size allows them to get closer to all cells.
The red blood cells are very flexible, so…
they are able to deform when they pass through narrower vessels.
The red blood cells are flexible due to…
a special cytoskeleton made up of a network of proteins that are elastic and can return the cell to the original shape.
The red blood cells do not have these organelles:
No nucleus, no mitochondria and no endoplasmic reticulum. This allows more haemoglobin to be in one cell.
White blood cells are also called…
leucocytes.
The white blood cells have…
nucleus, but the shape varies depending on the type.
Most of the white blood cells are larger than…
the red blood cells apart from lymphocytes, which are slightly smaller.
Phagocytes are…
cells that destroy microorganisms by engulfing it(phagocytosis).
