What system is responsible for delivering oxygen and nutrients to the body's tissues?

The cardiorespiratory system is integral to the process of delivering oxygen and nutrients to the body's tissues. This system encompasses both the cardiovascular and respiratory systems. The cardiovascular system, which includes the heart and blood vessels, is responsible for circulating blood throughout the body. This blood transports oxygen obtained from the lungs through the respiratory system, along with essential nutrients from the digestive system, to all bodily tissues.

Through a process known as gas exchange, oxygen enters the bloodstream in the lungs while carbon dioxide is expelled. The heart then pumps this oxygen-rich blood to various organs and tissues, ensuring they receive the essential elements needed for energy production and metabolic functions. At the same time, the nutrients derived from food digested by the digestive system also enter the bloodstream, further contributing to cellular health and function.

In contrast, while the muscular system enables movement and the nervous system regulates bodily functions, they do not have primary roles in the transportation of oxygen and nutrients. The digestive system is responsible for breaking down food and absorbing nutrients, but it does not transport them; this function is fulfilled by the cardiorespiratory system.