Question

Why is blood needed by all parts of our body?

Answer 1

Blood is a bodily fluid that carries metabolic waste products away from cells while supplying essential nutrients and oxygen to them in humans and other species. In vertebrates, it is composed of blood cells suspended in plasma.

Complete Answer:
Humans cannot survive in the absence of blood. Without blood, the body's organs would be deprived of oxygen and nutrients, and we would be unable to maintain body temperature, combat pathogens, or remove waste. If we didn't have enough blood, we'd become weak and die.
All parts of the body receive oxygen and nutrients from blood, helping them to function properly. Blood transports carbon dioxide and other waste products to the lungs, kidneys, and digestive system, where they are expelled from the body. Blood also helps the body combat diseases and transports hormones.
Blood consists of blood cells and plasma. Plasma is a yellowish fluid containing nutrients, proteins, hormones, and waste. Different types of blood cells perform different functions.
The heart pumps blood throughout our bodies, carrying oxygen to every cell, with each heartbeat. After supplying oxygen, blood returns to the heart.The blood is then sent to the lungs by the heart to pick up more oxygen. This cycle is repeated indefinitely.
Blood vessels in the circulatory system transport blood away from and toward the heart.
Blood is carried throughout our bodies by two types of blood vessels:
Arteries are vessels that transport oxygenated blood (blood that has received oxygen from the lungs) from the heart to the rest of the body.
Blood then travels through veins back to the heart and lungs to obtain more oxygen to send back to the body via the artery.
When the heart beats, you can feel blood flowing through the body at pulse points such as the neck and wrist, where large, blood-filled arteries run close to the skin's surface.

Note:
People can receive transfusions of the blood components they require, such as platelets, RBCs, or clotting factors. When a person donates blood, the whole blood can be separated into its various components and used in these ways.