Which is a true statement about enzyme activity ph and enzyme action?

a. all enzymes work best at a neutral ph

b. adding more acid does not affect the rate of activity of an enzyme

c. enzymes function only in a ph range of 4.0 to 5.5

d. the activity of an enzyme is affected by ph

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.