Final answer:
The correct option is a.The false statement about the circulatory system is that 'Blood in the left chambers of the heart have a lower oxygen content than blood in the right chambers.' In reality, the left side of the heart has oxygen-rich blood, whereas the right side contains deoxygenated blood.
Step-by-step explanation:
The circulatory system is essential for transporting blood throughout the body, and understanding its function is crucial for learning about human physiology. Among the statements provided, the one that is false is: Blood in the left chambers of the heart have a lower oxygen content than blood in the right chambers. The left side of the heart actually contains oxygen-rich blood which has been oxygenated in the lungs and is ready to be distributed to the rest of the body. This contrasts with the right side, which holds deoxygenated blood coming from the systemic circulation, ready to be sent to the lungs.
The normal cardiac cycle can occur without direct autonomic stimulation because of the heart's own conductive cells, such as those in the sinoatrial node, which generate the impulses that cause the heart muscles to contract. Ventricular fibrillation is indeed a life-threatening condition where the heart's normal rhythm is disrupted. Lastly, blood does flow from veins to arteries through the heart's chambers, and the walls of arteries, like the femoral artery, are thicker than those of veins, due to the higher pressure and the need to withstand it.
Therefore, the correct option of the statement that is false is 'a. Blood in the left chambers of the heart have a lower oxygen content than blood in the right chambers.'