Complete the sentences using the correct form of the words and phrases below.

contain   electrical impulse   organ   locate   nerve   be responsible for   atom   relate to

【小题1】The brain is the most important ________ in the human body.
【小题2】It________ over one hundred billion ________ cells.
【小题3】The nerve cells in our brain are connected by ________
【小题4】There are more possible connections in one brain than there are ________ in the universe.
【小题5】Different parts of our brain are ________ different parts of our body.
【小题6】There are different areas in the brain that ________ different functions.
【小题7】Scientists have ________ different areas of the brain.