The nerve roots that fuse to form the spinal nerves serving the upper and lower limbs are attached to the spinal cord at the cervical and lumbar enlargements of the spinal cord. true or false

i think its the first one

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.