Red blood cells pick up oxygen in the lungs. Blood travels away from the heart and lungs through the arteries. Red blood cells drop off oxygen to the cells through tiny tubes called capillaries. Blood then returns to the heart through the veins and the cycle begins again.
Marijuana is the the drug derived from the hemp plant.
<span>ALSO ON HUFFPOST:Unexpected Side Benefits Of Exercise</span>Suggest a correction<span>Sarah Klein </span>Senior Editor, Health & Fitness; Certified Personal TrainerMORE:Huffmag Your Body On Exercise Best Of Huffpost Exercise Physiology Body On ExerciseCONVERSATIONS
Make you more able to do hard tasks in the morning, and make you feel great!
