Biology · Neural Control and Coordination · NEET
| System involved | Neural system (neurons, brain, spinal cord, nerves) | Endocrine system (glands and hormones) |
| Messenger | Electrical impulse + neurotransmitter at synapse | Hormone carried in blood |
| Pathway | Point-to-point wired neuron network | Blood stream (reaches many organs) |
| Speed of response | Very fast (almost instant) | Slow (blood must circulate) |
| Duration of effect | Short-lived | Long-lasting |
| Target | Specific organ or muscle | Widespread; many target organs |
Yes. In NEET and NCERT, 'chemical coordination' and 'hormonal coordination' mean the same thing. Both refer to the endocrine system, which uses hormones as chemical messengers. NCERT says the endocrine system provides 'chemical integration through hormones', so the two names point to one system.
Neurons do use a chemical (neurotransmitter) at the synapse, but only across a tiny gap between two cells, and it acts for a very short time. The main pathway is still an electrical impulse travelling along a wired neuron. In hormonal coordination the chemical (hormone) itself travels a long way through the blood. So NEET classifies nerve signalling as 'neural' because the message is carried mostly by point-to-point neurons, not by a chemical moving through blood.
Neural coordination uses a direct, point-to-point wired network of neurons, so the impulse reaches the exact target organ almost instantly. Hormonal coordination sends hormones into the blood, and the blood must circulate before the hormone reaches organs. Blood flow is much slower than a nerve impulse, so hormonal responses take longer to start.
Hormonal (chemical) coordination lasts longer because the hormone stays in the blood and keeps acting until it is broken down. Neural coordination is short-lived because the impulse ends quickly. This is why fast reflexes (like pulling your hand off a hot pan) are neural, while slow, long processes (like growth or metabolism) are hormonal.
They work together. NCERT states that the neural system and the endocrine system 'jointly coordinate and integrate all the activities of the organs' so the body functions in a synchronised way. For example, during exercise nerves speed the heartbeat quickly, while hormones sustain the changes. They are two teams doing one job, not rivals.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
The neural system and the endocrine (hormonal) system. NCERT says they jointly coordinate and integrate all body activities so organs work in a synchronised fashion.
In neural coordination the message travels as an electrical impulse along neurons, with a neurotransmitter at synapses. In chemical coordination the messenger is a hormone carried by blood.
Because neurons form an organised, wired network that carries the signal directly from one exact point to another target, giving quick coordination. Hormones instead spread widely through the blood.
Hormonal coordination is longer lasting because the hormone stays in the blood and acts over time. Neural coordination is fast but short-lived.
The neural system controls quick reflexes because nerve impulses travel fast along point-to-point neurons, allowing an almost instant response.
