Which of the following could indicate a problem in the cardiovascular system?

An increase or decrease in pulse rate is a significant indicator of cardiovascular health. The pulse rate reflects the heart's ability to pump blood effectively throughout the body. A normal resting pulse rate typically ranges from 60 to 100 beats per minute. Any deviation from this range, whether an increase (tachycardia) or a decrease (bradycardia), can indicate underlying issues within the cardiovascular system, such as heart disease, dehydration, or even systemic infection.

An increased pulse rate might suggest the body is trying to compensate for conditions such as low blood pressure or blood loss, whereas a decreased pulse rate could indicate potential issues like heart block or significant athletic conditioning. Noticing changes in pulse is essential for monitoring a person's cardiovascular status and responding appropriately.

While other symptoms like an increase in body temperature, changes in skin hydration, or changes in hair growth can point to various health issues, they are not as directly linked to cardiovascular function as fluctuations in pulse rate are.