A Level Biology Practice Exam

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Master the A Level Biology Exam. Use flashcards and multiple choice questions with hints and explanations to ace your test. Start your journey to excellence!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the primary function of the bundle of His?

To regulate heart fluid balance
To conduct electrical signals through the heart septum
To support blood flow in the heart
To provide structural integrity to the heart

The correct answer is: To conduct electrical signals through the heart septum

The primary function of the bundle of His is to conduct electrical signals through the heart septum. This specialized bundle of heart muscle fibers is critical in the cardiac conduction system, as it transmits the electrical impulses generated by the sinoatrial (SA) node, which is responsible for initiating each heartbeat. The bundle of His splits into the right and left bundle branches, ensuring that the electrical signals are conveyed efficiently to the ventricles, leading to coordinated contraction and effective pumping of blood. The other options focus on different aspects of heart function that do not accurately describe the role of the bundle of His. For instance, while fluid balance and blood flow are essential functions of the heart, they are regulated by other structures and mechanisms rather than the bundle of His itself. Additionally, the structural integrity of the heart involves various tissues and support systems, which are separate from the electrical conductive function performed by the bundle of His.