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The cardiovascular system consists of the heart, blood vessels, and blood. This system has three main functions: Transport of nutrients, oxygen, and hormones to cells throughout the body and removal of metabolic wastes (carbon dioxide, nitrogenous wastes).
Eukaryotic gene expression can be regulated at many stages. 1  Chromatin accessibility. The structure of chromatin (DNA and its organizing proteins) can be regulated. More open or ârelaxedâ chromatin makes a gene more available for transcription. 2  Transcription. Transcription is a key regulatory point for many genes.