Evaluating each option:
Cushioning the brain and spinal cord: CSF acts as a shock absorber, protecting the central nervous system.
Removing metabolic waste: CSF helps in the removal of waste products from the brain.
Transporting nutrients to the brain: CSF delivers essential nutrients to neural tissues.
Transmitting nerve impulses: Nerve impulses are transmitted by neurons through electrical and chemical signals, not by CSF.
Conclusion: The incorrect use of CSF among the options is transmitting nerve impulses.
During the ventricular systole, the atrioventricular valves (P) ________ and the semilunar valves (Q) _________.
Mohit, a 30-year-old man was a software professional leading a sedentary life. He showed signs of high blood sugar during a routine health check-up despite having a normal body weight. 
(a) The hormonal disorder he is suffering from.