A) What happens to your heart rate during exercise if you are very fit?
B) What your blood is made of?
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A) our heart rate will increase
B) our blood is made of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. ... The solid part of your blood contains red blood cells, white blood cells, and platelets. Red blood cells (RBC) deliver oxygen from your lungs to your tissues and organs.
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