What are the main functions of the circulatory system?

• A. Transporting nutrients and oxygen to cells
• B. Producing hormones for body regulation
• C. Filtering waste from the blood
• D. Breaking down food into absorbable units

Answer: (A)

Verified step by step guidance

1. Understand that the circulatory system is a complex network that includes the heart, blood, and blood vessels, and its primary role is to maintain homeostasis by transporting substances throughout the body.
2. Recognize that one of the main functions of the circulatory system is to transport nutrients and oxygen to cells. This involves the heart pumping oxygenated blood from the lungs to the rest of the body, where oxygen and nutrients are delivered to cells.
3. Acknowledge that the circulatory system also plays a role in producing and transporting hormones. Hormones are chemical messengers that regulate various physiological processes, and they are distributed via the bloodstream to target organs and tissues.
4. Identify that the circulatory system is involved in filtering waste from the blood. The kidneys, which are part of the circulatory system, filter blood to remove waste products and excess substances, which are then excreted as urine.
5. Clarify that breaking down food into absorbable units is not a function of the circulatory system. This process is primarily the role of the digestive system, where food is broken down into nutrients that can be absorbed into the bloodstream.