Which body system primarily handles the transfer of oxygen and nutrients?

The circulatory system is primarily responsible for the transfer of oxygen and nutrients throughout the body. This system includes the heart, blood vessels, and blood, working together to circulate blood. When blood is pumped from the heart, it travels through arteries to various tissues and organs, delivering essential oxygen and nutrients that cells need for energy and function.

While other systems play crucial roles in overall health, they do not directly handle the transfer of oxygen and nutrients. The digestive system is involved in breaking down food and absorbing nutrients but does not transport them throughout the body. The nervous system is responsible for transmitting signals and coordinating bodily functions but does not directly handle nutrient transport. The endocrine system regulates hormones that can affect various processes within the body but does not serve as the primary means of transferring oxygen and nutrients. Hence, the circulatory system is the key player in this crucial function.