Final answer:
The autonomic nervous system (ANS) comprises of motor fibers that control involuntary functions by conducting impulses from the CNS to smooth and cardiac muscle, as well as glands. Hence, the accurate option for the ANS is (a) which describes its role in controlling involuntary physiological processes.
Step-by-step explanation:
The question asks about the autonomic nervous system (ANS), specifically which description correctly fits the ANS. The ANS is part of the peripheral nervous system that regulates involuntary physiologic processes, including heart rate, blood pressure, respiration, digestion, and sexual arousal. It consists of motor fibers that conduct nerve impulses from the central nervous system (CNS) to smooth muscle, cardiac muscle, and glands. Thus, the correct answer is (a) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands. This system is involuntary and regulates essential functions of internal organs and is essential for maintaining homeostasis in the body.