Question

question 4
why do you think the change in pulse rate helps your body maintain homeostasis?

Explanation:

Homeostasis involves maintaining internal balance. During activity, cells need more oxygen and nutrients, and produce more waste. A higher pulse rate (heart rate) increases blood flow, delivering more oxygen/nutrients to cells and removing waste (like CO₂) faster. When at rest, pulse rate decreases to match lower metabolic demands, ensuring stable internal conditions.

Answer:

The change in pulse rate helps maintain homeostasis because during physical activity (or when metabolic demands increase), a higher pulse rate (faster heart rate) increases blood circulation, delivering more oxygen and nutrients to cells while removing waste products (e.g., carbon dioxide) more efficiently. When the body is at rest (or demands decrease), the pulse rate slows to reduce energy expenditure and match the lower metabolic needs, ensuring the body’s internal environment (e.g., oxygen levels, nutrient availability, waste removal) remains stable.