1. during a heart attack, some of the cells in the thick layer of muscle in the heart walls die. this layer of muscle is called the (1 point) a) do not choose. b) pericardium. c) connective tissue layer. d) myocardium. 2. through which path does blood typically flow through the circulatory system? (1 point) a) arteries → capillaries → veins b) veins → capillaries → arteries c) arteries → veins → capillaries d) do not choose 3. which type of blood vessel carries blood away from the heart? (1 point) a) do not choose b) arteries c) capillaries d) lymph nodes 4. in the heart, the mixing of oxygen-rich and oxygen-poor blood is prevented by the (1 point) a) do not choose. b) do not choose. c) septum. d) pericardium. 5. the circulatory system works with which other body system to supply the body’s cells with the nutrients they need? (1 point) a) do not choose b) the digestive system c) the integumentary system d) the muscular system