Question
How does the heart beat?
a. the muscles squeeze when the ventricles get full
b. through an electrical system
c. gravity
d. exercise
a. the muscles squeeze when the ventricles get full
b. through an electrical system
c. gravity
d. exercise
Answers
GPT-4o mini
The correct answer is **b. through an electrical system**.
The heart beats in response to electrical impulses generated by the sinoatrial (SA) node, which acts as the natural pacemaker. These electrical signals cause the heart muscles to contract and pump blood throughout the body. While the muscles do indeed squeeze when the ventricles are full (related to option a), the primary mechanism for the heartbeat is the electrical system. Options c (gravity) and d (exercise) do play roles in overall circulation and heart function but are not the fundamental reasons why the heart beats.
The heart beats in response to electrical impulses generated by the sinoatrial (SA) node, which acts as the natural pacemaker. These electrical signals cause the heart muscles to contract and pump blood throughout the body. While the muscles do indeed squeeze when the ventricles are full (related to option a), the primary mechanism for the heartbeat is the electrical system. Options c (gravity) and d (exercise) do play roles in overall circulation and heart function but are not the fundamental reasons why the heart beats.