Which chamber of the heart receives the deoxygenated blood from the systemic system first?

Which description provides the best objective summary of the article in the passage?

Which of these internal feedback reactions does not need your brain? oa. your leg jumping when it is hit by a reflex hammer b. your deeper breathing when you need more oxygen c. your body temperature rising when you have an infection d. your heart beating faster when you are in danger

What factors (physical and biological) can affect the levels of dissolved oxygen in the gulf waters?