Final answer:
Efferent nerves are known as motor nerves; they transmit impulses from the CNS to muscles and glands, initiating actions such as muscle movements or glandular responses.
Step-by-step explanation:
Efferent nerves are also known as motor nerves. These nerves carry nerve impulses from the central nervous system (CNS) to the effector organs, which include muscles and glands. Efferent nerves are responsible for converting nerve signals into actions, such as muscle movements or glandular secretions.
Thus, the correct answer is d. motor nerves. It's important to note that they are different from sensory nerves, which carry impulses from sensory receptors to the CNS, and interneurons, which connect sensory and motor neurons within the CNS. Efferent nerves are part of the peripheral nervous system (PNS), which is made up of nerves and ganglia outside the CNS.