填空题

The human brain is the most complex structure in the universe. It contains (36) 100 billion nerve cells, each of which has thousands of connections with each other. Their (37) controls each of the body’s functions, allows thoughts, perceptions, memories, feelings, and also (38) and communication. Understanding just how the brain works, in health or in sickness, is one of the greatest (39) of our time. What is determined by genes, what is formed by experience Scientists-are (40) all aspects of the nervous system. Great progress can be (41) in visualizing and modeling brain functions, as well as in research into their biological basis. Today, it is (42) that 30 to 50 percent of human genes exercise their function chiefly in the brain. This gives an (43) of the complexity of the genetic control and development. (44) . Half of all genetic diseases affect the nervous system. The brain can only reach its full capability through interaction with its surroundings. (45) . How do nerve cell processes find their goal How do different brain areas develop How do perceiving functions mature Thanks to research, the prevention and cure of many brain diseases seems possible for the first time. (46) .