Biology

I

II

III

IV

Lipid

Glucose

Urea

Uric acid

blood sugar

glycogen

bile

urea

Ovary

Pancreas

Adrenal

Thyroid

\(Receptor\to sensory neuron \to synapse \to intermediate neuron \to synapse \to motor neuron \to effector\)

\(Receptor \to motor neuron \to synapse \to intermediate neuron \to synapse \to sensory neuron \to effector\)

\(Effector \to intermediate neuron \to synapse \to motor neuron \to synapse \to sensory neuron \to receptor\)

\(Effector \to motor neuron \to synapse \to sensory neuron \to synapse \to intermediate neuron \to receptor\)