What physiological factors increase with heightened respiration?

The correct choice highlights physiological factors that increase during heightened respiration. When the body experiences increased activity or stress, it demands more energy. This energy is generated through cellular respiration, which requires more oxygen and produces more carbon dioxide.

Breathing rate increases to bring more oxygen into the lungs and to expel carbon dioxide more rapidly. Elevated breath volume means that more air is cycled through the lungs with each breath, facilitating the efficient exchange of gases. Alongside this, heart rate rises to pump more oxygenated blood to the muscles and organs that require it, ensuring that the tissues receive sufficient oxygen to meet their metabolic needs during activity.

These changes work together to support greater energy output and performance, which is essential in both exercise and moments of stress. Understanding these physiological responses is crucial for grasping how the body maintains homeostasis and meets increased demands placed on it.