Blood clots will do this. Cutting off blood flow while also increasing blood pressure. Also, if the viscosity (thickness of the blood) is thick which will slow down the flow and cause the body to use more effort to pump blood.
Liters/cl/ml/dl for liquids and cubic meters/cm/mm/km for solids
Answer:
Solar Energy
The sun radiates solar energy to the earth and it is used for other things.
