Question

Blood contains different parts, mainly plasma and red blood cells. When people give

blood, there are machines that can separate these parts. However, when looking at
blood, its different parts cannot be seen. What is blood?

Answer 1

Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. In vertebrates, it is composed of blood cells suspended in blood plasma.