National League for Nursing (NLN PAX) Exam 2025 – 400 Free Practice Questions to Pass the Exam

The circulatory system is responsible for the transport of essential nutrients and oxygen throughout the body. It consists of the heart, blood vessels, and blood. The heart pumps oxygen-rich blood from the lungs to the rest of the body and returns oxygen-poor blood to the lungs for reoxygenation. Alongside oxygen, the circulatory system moves glucose, hormones, and other vital substances to cells, ensuring that all body tissues receive what they need to function properly. This is vital for maintaining homeostasis and overall health.

The digestive system primarily focuses on breaking down food to extract nutrients, while the nervous system coordinates actions and sensory information. The endocrine system regulates bodily functions through hormones, but it does not transport nutrients or oxygen like the circulatory system does. Each of these other systems plays important roles, but they do not directly handle the transportation of nutrients and oxygen in the same way the circulatory system does.