hemoglobin.
hemoglobin
Red blood cells have haemoglobin which helps in the transport of oxygen and carbon dioxide.
Red blood cells carry oxygen to the parts of the body that need it, and return carbon dioxide to the lungs to be expelled.
Blood is the red substance that carries chemicals, nutrients, and oxygen around your body. It is pumped by the heart through blood vessels to deliver these essential components to your cells and organs.
Nutrients, waste products, and ions.
Red blood cells contain hemoglobin. These cells are also known as erythrocytes.
Blood is the serum, cells, platelets, and proteins, hormones, and chemicals that circulate in the blood stream. The cells that comprise blood include white blood cells and red blood cells. Red blood cells are also called erythrocytes, from the Greek erythros for "red" and cyte for "cell".Put another way, blood is the whole; erythrocytes are a part.
As the name says, red blood cells are found in the blood. If there is blood there, there is red blood cells.
The cells in the bloodstream include red blood cells, white blood cells, and platelets. Red blood cells carry oxygen to tissues, white blood cells help fight infections, and platelets aid in blood clotting.
Red blood cells (also called erythrocytes)
Red blood cells because that is what carries oxygen throughout the body
White blood cells have a nucleus and red blood cells don't.