Question

1. pulse rates increase for most people after exercise. explain why this connection between pulse rate and activity makes sense from a biological perspective. 3

• include at least two systems
• describe each systems specific functions
• identify one molecule

Explanation:

During exercise, the muscular system requires more energy. The cardiovascular system (heart and blood vessels) increases pulse rate to pump more oxygen - rich blood (carrying the molecule oxygen, \(O_2\)) to the muscles. The respiratory system also works harder to take in more \(O_2\) (from the air) and expel more carbon dioxide (\(CO_2\)). The increased pulse rate ensures that the muscles get the necessary \(O_2\) for aerobic respiration (to produce adenosine triphosphate, ATP - the energy currency of the cell) to meet the higher energy demands of exercise.

Answer:

Pulse rate increases after exercise as the cardiovascular system pumps more oxygen - rich blood (carrying \(O_2\)) to the working muscles (muscular system). The respiratory system aids in taking in more \(O_2\) and expelling \(CO_2\). The molecule \(O_2\) is crucial for aerobic respiration in muscles to produce ATP for energy.