How does space affect your body?

Out in space there is no gravity. So how does living in space affect the human body?
How does it affect your heart, your bones and your brain?
What do astronauts do to in space to replicate life on earth?

Hi, my name is Rachel. I am the chief editor's better half. I am a part-time pharmacist, full time mum of three kids. I love running, going to the gym and crafts.