ATI Pathophysiology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of the circulatory system is to transport nutrients, oxygen, hormones, and waste products throughout the body. This system consists of the heart, blood vessels, and blood, working together to ensure that all body tissues receive the necessary substances for cellular metabolism and function. Oxygen is carried from the lungs to the tissues, while carbon dioxide is transported back to the lungs for exhalation. Nutrients absorbed from the digestive tract are distributed to cells for energy, growth, and repair. Additionally, hormones released by endocrine glands enter the bloodstream and are delivered to target organs, coordinating various physiological processes.

While filtering waste products from the blood, enabling digestion, and regulating body temperature are important functions related to overall homeostasis, they are not the primary role of the circulatory system itself. Instead, those functions may involve other organ systems, such as the excretory system for waste filtration, the digestive system for food processing, and thermoregulation involving the integumentary and muscular systems. The comprehensive transport and distribution mechanism of the circulatory system is essential for maintaining life and supporting all bodily functions.