Which statement about the peripheral nervous system (PNS) is correct?
1
The autonomic nervous system (ANS) is solely responsible for voluntary muscle movements.
2
The somatic nervous system (SNS) regulates involuntary functions such as heart rate and digestion.
3
The PNS includes the cranial nerves, spinal nerves, and peripheral nerves, all of which connect the CNS to the limbs and organs.
4
Schwann cells in the PNS are only involved in producing neurotransmitters, not in myelination.