Question

What is blood?

Answer 1

Blood is the substance that flows through your veins and arteries taking oxygen to your vital organs. Blood contain haemoglobin, which is the hormone that makes it red. Blood contains platelets, red blood cells, white blood cells, and plasma.

Red blood cells have no nucleus, so that they can carry more oxygen, and because of this, they have a large surface area to volume ratio.

White blood cells produce antibodies to help defend your body against viruses or pathogens that may try and attack the central nervous system.

Platelets are what helps blood to clot when you get a cut, and this prevents any harmful bacteria from entering the wound while it heals.

Plasma is the substance that makes up the rest of your blood, and it carries water, waste products, glucose, amino acids, minerals, vitamins, salts, carbon dioxide, urea, and hormones