In addition to endocrine glands, some organs whose functions are primarily nonendocrine also produce hormones. these endocrine tissues include heart and kidneys.   
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The heart can act as an endocrine organ by releasing natriuretic peptides that lower the blood pressure. Those are an A-type natriuretic peptide (ANP) from the from stretched atria and B-type natriuretic peptide (BNP) from the ventricles.</span>   
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The kidney secretes two hormones: erythropoietin (EPO) which increase the production of red blood cells and calcitriol (active vitamin D3) which promotes the absorption of Ca and its release from the bones.</span>
        
             
        
        
        
No. Glucose is split by glycolysis before the aerobic parts of cellular respiration, when oxygen enters the process.
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In the presence of an enzyme, the Activation energy is lowered. thus the reactions reaches the activation energy and the reaction is initiated faster and therefore completes faster than the reactions without enzymes. Enzymes lower activation energy, which allows a reaction to occur at a faster rate.
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Energy is lost at each trophic level.