When a pregnant woman had her blood sampled back in 1972, doctors discovered it was mysteriously missing a surface molecule ...

Polycythemia vera (PV) causes your bone marrow to make too many red blood cells. You need these cells to carry oxygen around your body, but too many of them can make your blood thicken and form clots.

Require immediate backup! Narrator: Your blood has different cells with different jobs. Some cells do repairs if you get a cut. Red blood cells deliver oxygen and take away rubbish. And your white ...

Red blood cells placed in a solution with the same water concentration as their cytoplasm (0.85 per cent salt solution) will not experience an overall change in volume. No osmosis occurs.