Which body function does not rely on fat? 2 points nerve insulation estrogen production (steroid hormones) insulin production (peptide hormones) digestion

As cell after cell rapidly transmits the electrical charge, the entire heart contracts in one coordinated motion, creating a heartbeat. ... The SA node (called the pacemaker of the heart) sends out an electrical impulse. The upper heart chambers (atria) contract. The AV node sends an impulse into the ventricles.