Sometimes, you didn't notice something that you do almost every seconds. What are they?
Heart beat
Your heat muscle contract 24 hours a day, 7 days a week to pump blood to your body to supply nutrients.
Breathing
Your breathing rate is controlled by the respiratory centre in your brain. You do not need to think when you breathe, i guess...
Muscle contraction
You always contract some of your muscle. When one muscle relaxes, the other muscle opposing that muscle contracts.
Chemical reaction
You always carry out different kinds of chemical reactions in your body, no matter you don't even know the answer for “What is Chemistry?”.
Using your brain
From now on, you couldn't ask people questions like “Have you ever use your brain?” It is because we always use our brain(for body balance, receive signals, etc), even when you are not thinking anything. Maybe you can change your question into “Have you ever use your cerebrum?”
Producing water
Yes, your body always produce water by respiration. However, you should always drink 6-8 cup of water a day as you produce only a small amount.
Using energy
You consume energy, even when you are inactive or sleeping. The energy is used for muscle contraction and some regulations of your body.
Trading
You do not trade money or goods in your body. Instead, trading occurs between your blood capillaries and your cells. The blood capillaries offer nutrients and the cells offer junk like carbon dioxide, how mean are the cells...
