Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
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Answer:
Drink Water While You're Exercising. Even if you hydrate before and after exercise, you should still be taking in fluids during your workout. ...
Tire Out Your Muscles. ...
Rest Between Weight Training Sets. ...
Keep Good Form on Cardio Machines, Too. ...
Breathe When You Stretch
Explanation:
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