Which of the following triggers muscles of a frog's hind legs to contract?
A) neurons of the motor system B) nerves of the enteric nervous system C) afferent neurons of the PNS D) parasympathetic nerves of the autonomic nervous system
Which of the following circulates through the ventricles of the brain and central canal of the spinal cord and supplies the central nervous system (CNS) with nutrients and hormones?
A) blood distributed by the carotid arteries B) blood that drains into the jugular vein C) cerebrospinal fluid D) cerebral lymphatic fluid