More ATP is needed to perform physical exertion activities. Lungs, heart and blood vessels have to deliver more __(a)__ to the muscles to supply the required __(b)__

(a) oxygen; (b) energy

Explanation:

Adenosine triphosphate (ATP) is the main source of energy for most cellular processes. ATP is known as 'the energy coin of the cell' because the hydrolysis of its high-energy phosphate bonds provides energy which is then used by the cells in metabolic processes. Moreover, the process of cellular respiration requires oxygen as a substrate to generate ATP. In consequence, cells with a higher energy requirement require more oxygen supply to generate more ATP.

there are men and women, some choose to be both or change their gender. often times those people go by "other". those who change their gender are known as "transgender"

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