Answer:
The reason is because the heart requires more oxygen when exercising. Several physiological events happen to increase the blood flow and therefore oxygen flow to that muscles,including the heart.
Also the volume of blood that the heart pumps out is maintained so that the body organs receive the necessary amount of oxygen and nutrition, because if it didn't adjust the flow of blood to match activity level, you will be insufficient. Either output method will be lower than needed.
Answer:
Hey Emanuel, Popeye's chicken sandwich was so popular when it first came out as you may know, but now it has been slow decreasing in popularity for some unknown reason over the world.
Hope that helps you a little and let me know if you want me to explain something else for you. :)
Answer:
C learning how to sleep better
