ID 212254860 © VectorMine | Megapixl.com
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
happy positive chemicals hormone mood emotion feeling dopamine serotonin oxytocin endorphin molecular biology medical medicine science brain symbol biochemistry physiology isolated antidepressant organic molecule element illustration human health happiness anatomy vector model good infographics information love behavior scheme pleasure reaction collection outline diagram labeled reward pain relief description educational