Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells, and transports metabolic …

It has four main components: plasma, red blood cells, white blood cells, and platelets. The blood that runs through the veins, arteries, and capillaries is known as whole blood—a mixture of …

2025年7月21日 · Blood is a specialized fluid that constantly flows throughout your body. It’s made of plasma, red blood cells, white blood cells and platelets.

2023年3月16日 · Blood is a vitally important fluid for the body. It is thicker than water, and feels a bit sticky. The temperature of blood in the body is 38°C (100.4°F), which is about one degree …

3 天之前 · Blood is a fluid that transports oxygen and nutrients to cells and carries away carbon dioxide and other waste products. It contains specialized cells that serve particular functions. …

Detailed information on blood, including components of blood, functions of blood cells and common blood tests.

2021年12月17日 · Your blood carries oxygen and nutrients to all of the cells in your body. Blood cells also fight infection and control bleeding.

2023年5月11日 · Blood has many functions in your body. Blood tests help doctors check for certain diseases and conditions. Learn about blood types and blood tests.

The main job of red blood cells, or erythrocytes, is to carry oxygen from the lungs to the body tissues and carbon dioxide as a waste product, away from the tissues and back to the lungs.

Once blood is pumped out of the heart, it takes 20 to 30 seconds to make a complete trip through the circulation and return to the heart. Test your Knowledge Take a Quiz!