Human blood is made up of both liquid and solids and the liquid part of the human blood is Plasma which is made up of protein, salt and even water.
The solid part of human blood is made up of red blood cells, white blood cells and also platelets.
The blood in our bodies is very important as it helps carry oxygen through our bodies to our brains.
Without the blood carrying oxygen to our brains we would not be able to survive.
The human blood is a vital body fluid that delivers the highly necessary substances including things such as nutrients and oxygen to the cells and blood also transports metabolic waste products away from those same cells. In vertebrates.
Human blood is composed of blood cells suspended in blood plasma.
The same is true for other animals that have blood as well such as dogs, cats, horses, cows etc.