Complete the task. Read the text below. Transform the words in brackets in capital letters (so that they match the content lexically and grammatically). Use them to fill in the gaps.

Write one word in each gap.

In a series of lectures at Yale University in 1904, British neurophysiologist Charles Scott Sherrington gave the first extensive description of the human [ ] (NERVE) system. He explained how it functions and directly influenced the development of brain surgery and treatment for neurological disorders.

One of Sherrington's ideas was that muscles do not simply receive instructions from the nerves that travel to them from the spinal cord; they also [ ] (GENERATION) and send [ ] (INFORM) back to the brain about muscle position and tone. The body needs it to control [ ] (MOVE) and posture.

Back in 1626, French philosopher and scientist René Descartes had observed reciprocal innervation — the way the activation of one muscle influences the [ ] (ACTIVE) of others — but Sherrington's studies in the 1890s clarified how the process works. "Sherrington's law" established that for every activation of a muscle, there is a corresponding relaxation of the opposing muscle.