SOPHIA Human Biology Unit 5 – Challenge 5 (LATEST ANSWERS)

— 1 Cardiovascular System Understand the system of blood vessels. What vessels carry blood away from the heart? • a.) Veins • b.) Atria • c.) Arteries • d.) Venules 2 — Heart and Blood Flow Identify the major structures of the heart and the specific role in the overall functioning of the heart. Which of the following describes the atrium? • a.) The thick wall that divides the heart in half • b.) The upper chamber of each half of the heart • c.) The lower chamber of each half of the heart • d.) The valve that separates the upper and lower chambers of the right half of the heart 3 — Cardiac Cycle and Cardiac Conduction System Determine the components of the cardiac cycle. What is the role of the SA node in the heart? • a.) It causes the chambers of the heart to relax after a contraction. • b.) It produces two electric signals: First for the atria to contract and second for the ventricles to contract. • c.) It slows down the electric signal to the ventricles so they beat after the atria. • d.) It originates the electric signal that causes the heart to beat. 4 — Blood Pressure Understand how blood pressure is