Explain that natural resting heart rate is controlled by a group of cells in the right atrium acting as a pacemaker.

Natural resting heart rate is controlled by a group of cells in the right atrium acting as a pacemaker. The heart and blood vessels sits within Animal tissues, organs and organ systems, so this idea should be explained in that specific biological context rather than as an isolated phrase. A useful term here is heart, because heart is a curriculum-aligned term linked to the learning objective: Explain that natural resting heart rate is controlled by a group of cells in the right atrium acting as a pacemaker. Avoid giving a vague answer instead of directly addressing: Explain that natural resting heart rate is controlled by a group of cells in the right atrium acting as a pacemaker; instead answer by clearly explaining how to explain that natural resting heart rate is controlled by a group of cells in the right atrium acting as a pacemaker. Use precise biological vocabulary when you explain how to explain that natural resting heart rate is controlled by a group of cells in the right atrium acting as a pacemaker. This keeps your answer tightly aligned to the approved learning objective for The heart and blood vessels.