Answer:
The correct answer will be option B.
Explanation:
Neurons are the structural and functional unit of the nervous system. Based on the transmission of nerve impulse these neurons can be divided into two divisions :
1. Afferent neurons: Neurons which transmit the impulse from the periphery to CNS- brain or spinal cord. Sensory neurons are such neurons which carry the impulse of stimulus to CNS.
2. Efferent neurons: Neurons which transmit the signals from the CNS to the periphery or muscle which causes voluntary action. Motor neurons are considered efferent neurons.
Thus, option B is the correct answer.
The finger bone of an elderly individual is going to take the longest to heal because the healing of a bone is dependent on the blood flow to that area. The elderly already have a weaker blood flow than healthy, young people, so the healing of their bones takes longer. On top of that, the finger gets less blood supply than the thigh bone, so it will take longer to heal than the thigh.