[Solved] Which of the following is not a factor that the rate of pulmonary and systemic gas exchange depends on? A) partial pressure difference of the gases B) surface area for gas exchange C) diffusion distance D) molecular weight and solubility of the gases E) force of contraction of diaphragm Arterial changes: Modifications or alterations in the arteries, often related to aging, disease processes, or lifestyle factors, affecting blood flow and cardiovascular health. Sinoatrial Node: A group of cells in the right atrium of the heart that initiates the electrical impulses determining the heart rate, often called the heart's natural pacemaker. Atherosclerotic Changes: Alterations in blood vessels characterized by the accumulation of fatty deposits along their inner walls. Internal Bleeding: Bleeding within the body that can result from injury or illness, potentially leading to serious health complications without immediate treatment.