Why are carbohydrates and fats considered high energy foods? ; a) they have a lot of oxygen atoms.; b) they have no nitrogen in their makeup.; c) they can have very long carbon skeletons.; d) they have a lot of electrons associated with hydrogen.; e) they are easily reduced.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

if you listed your answers right then i believe your answer is b.