32. The Sodium-potassium pump use ATP to actively transport__Na+ out of the cell and__ K+ into the cell. (A) 2:3 (B) 1:1 (C) 3:2 (D) 4；2

38. In humans, the central nervous system consists of the_____， which is housed in the _____and the_____, which is housed in the_____. (A) peripheral nervous system； limbs； brain； skull (B) brain； skull； spinal cord； vertebral column (C) spinal cord； vertebral column； sensory neurons； limbs (D) brain； vertebral column； spinal cord； skull