Ahuman red blood cell in an artery of the left arm is on its way to deliver oxygen to a cell in the thumb. from this point in the artery, how many capillary beds must this red blood cell pass through before it returns to the left ventricle of the heart?

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars