Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


When we inhale the oxygen enters our respiratory sytem then the circulatory system transport it to the different parts of the body , when the oxygenated blood is transported, it becomes deoxygenated and returns to our heart and lungs as we exhale it.
0 0 0
It will expand the oxygen
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts