What would happen if deoxygenated blood do not come back to heart?

If deoxygenated blood does not return to the heart, tissues and organs would become starved of oxygen, leading to cellular damage and dysfunction. This lack of oxygen can result in serious health issues, including organ failure and potentially death. The body would struggle to remove carbon dioxide and other metabolic waste, further exacerbating the condition. Ultimately, the circulatory system would fail to maintain homeostasis, threatening overall survival.