Answer: C) The cardiovascular system circulates blood throughout the body, delivering oxygen and nutrients to tissues and removing waste products.
Explanation: The cardiovascular system is made up of our veins, arteries, and heart. Veins are responsible for carrying blood towards the heart, while arteries pump blood away from the heart and out to the rest of the body. The heart pumps deoxygenated blood towards the lungs to pick up oxygen while it pumps oxygenated blood through the rest of the body in order deliver oxygen to the rest of the body's cells. In addition, the blood vessels also carry nutrients from the digestive system and delivers it to the rest of the body. Thus, choice C is the best description of the cardiovascular system's function. Let's go over each of the other answer choices.
Choice A describes the function of the endocrine system, a collection of glands and organs that release hormones to regulate bodily activities and metabolism.
Choice B describes the function of the skeletal system, composed of bones to maintain the structure of the body and protect internal organs.
Choice D describes the function of the muscular system, made up of a variety of muscles to control bodily movement and maintain balance.