If the mid-point (x, y) of the line joining (3, 4) and (p, 7) lies on 2x + 2y + 1 = 0, then what will be the value of p?

Explanation

Coordination ensures body parts work together. Two systems: nervous (fast, short-lived responses) and endocrine/hormonal (slower, longer-lasting responses). Both use chemical signals.

Nervous coordination: stimulus → receptor → sensory neuron → CNS → motor neuron → effector → response. Electrochemical signals travel along neurons; chemical signals cross synapses.

Hormonal coordination: gland releases hormone → blood carries to target organ → target organ responds. Feedback mechanisms maintain homeostasis (constant internal conditions). Both systems interact.