The output of the neuron is computed as the activation function applied to the sum directly:

$$a_2 = h(w_{21}z_1 + w_{22}z_2 + \dots) $$

You can have a look at the perceptron wikipage, where there are explanations and ilustrations of this, like this one.

The output of the neuron is computed as the activation function applied to the sum directly:

$$z_3 = h(w_{21}z_1 + w_{22}z_2) $$

You can have a look at the perceptron wikipage, where there are explanations and ilustrations of this, like this one.