Final answer:
Electrical capture of heart rhythm is the generation of electrical signals by the heart's pacemaker cells to regulate the contraction of the heart muscle. Mechanical capture is the physical contraction of the heart muscle in response to these electrical signals.
Step-by-step explanation:
Electrical capture of heart rhythm refers to the process by which the heart's pacemaker cells generate electrical signals that regulate the contraction of the heart muscle. These signals travel from the sinoatrial node to the atria, and then to the atrioventricular node and the ventricles, causing them to contract and pump blood effectively. On the other hand, mechanical capture refers to the physical contraction of the heart muscle that occurs in response to the electrical signals. The electrical signals initiate the mechanical action of the heart, resulting in the rhythmic beating that pumps blood throughout the body.