What occurs in the brain (with regard to our muscles) as we train and even as we sleep?​

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary