Final answer:
The longer loop that carries blood to and from body tissues is called the systemic circuit. It transports oxygenated blood from the left side of the heart to the head and body, and returns deoxygenated blood back to the heart.
Step-by-step explanation:
The longer loop that carries blood to and from body tissues is known as the systemic circuit.
This circuit is responsible for transporting oxygenated blood from the left side of the heart to the head and body, and returning deoxygenated blood back to the heart. The blood then re-enters the systemic circuit through the aorta and is distributed to the rest of the body.