What are voluntary muscles? dont copy anything from the internet if you dont know dont answer, i can see if you copied.

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

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b. passive c. facilitated d. active b. passive