Afferent nerve fibres are responsible for carrying sensory information from the receptors to the central nervous system (CNS). These fibres transmit impulses in the form of electrical signals, allowing us to perceive various sensations such as touch, pain, temperature, and pressure.

Explanation:

To understand why option B is the correct answer, let's break down the different options and their roles in the nervous system:

a) CNS to effector: This option refers to efferent nerve fibres, which transmit impulses from the CNS to the effector organs such as muscles or glands. These fibres control movements and other responses initiated by the CNS.

b) Receptor to CNS: This option correctly describes the function of afferent nerve fibres. They carry sensory information from the receptors (located in the sensory organs or throughout the body) to the CNS. This information includes stimuli such as touch, temperature, pain, and pressure.

c) Receptor to effector: This option is incorrect because it combines the functions of both afferent and efferent nerve fibres. Afferent fibres transmit information from the receptors to the CNS, while efferent fibres carry information from the CNS to the effectors.

d) Effector to receptor: This option is also incorrect because it describes the opposite direction of nerve impulse transmission. Nerve impulses typically travel from the receptors to the CNS, rather than from the effectors back to the receptors.

Conclusion:

In summary, afferent nerve fibres conduct impulses from the receptors to the CNS, allowing us to perceive different sensations. These fibres play a crucial role in our ability to sense and respond to the world around us.