Cardiac muscle, cardiac tissue, and the heart are grouped in what system? Options: Digestive, Circulatory, Respiratory, Nervous

Answer

The correct answer is the Circulatory system. In biological organization, cells with similar structures and functions group together to form tissues, such as cardiac tissue. Different tissues then combine to form an organ, such as the heart. Finally, a group of organs that work together to perform a specific function form an organ system. The heart, made of cardiac muscle and tissue, is the primary pump of the circulatory (or cardiovascular) system, which is responsible for transporting blood throughout the body. The other options are incorrect because the digestive system focuses on food processing, the respiratory system on gas exchange, and the nervous system on transmitting signals.