The main functions of white blood cells are to carry oxygen and against the diseases as our immune system.

The number of red blood cells is the highest among other blood cells.

Red blood cells have characteristics: biconcave in shape, have no nucleus, have hemoglobin, produced in bone marrow, elastic, and can live up to 4 months.

Blood plasma has a fewer number than blood cells.

Blood will protect us from the diseases only caused by virus.

Red blood cells (erythrocytes) have function to transport carbon dioxide and nutrients around your body.

Blood plays a role in blood clotting when an injury occurs.

The main components of the blood are red blood cells, white blood cells, and platelets.

Blood have function to transport oxygen and nutrient to the cells which need it.

Hemoglobin in red blood cells (erythrocytes) is a pigment that makes the blue color in the cells and have function to carry oxygen.

The characteristics of platelets: have the smallest size than the other blood cells and have a higher number than white blood cells.

White blood cells (leucocytes) have characteristics: the shape are bigger than erythrocytes, the number of white blood cells is less than the other blood components, have different shapes and sizes, and made in the bone marrow and lymph.