The pumping of the heart involves the alternate contraction and relaxation of the chambers of the heart. the upper chambers of the heart are called , and the lower chambers of the heart are called .

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Which is the correct formula for photosynthesis

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis