What molecules does a brain cell store

Simple sugars, the energy supply of choice for cells, are contained in long chains of complex sugars. Proteins that make up the cell structure and facilitate such important chemical reactions are made up of chains of 20 separate smaller molecules called amino acids.

Explanation:

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answer; i believe that the correct answer is (lung);

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.