Question

what is the functionality of structure c? a) it only combines excitatory signals b) it transmits an electrical message c) it is the life - sustaining part of the cell d) it blocks the neurotransmitters

Explanation:

Structure C appears to be an axon of a neuron. The main function of the axon is to transmit an electrical message (action - potential) away from the cell body to other neurons, muscles, or glands. It doesn't only combine excitatory signals (that's more related to integration at the dendrites and cell body), it's not the life - sustaining part of the cell (that's the cell body with its organelles), and it doesn't block neurotransmitters.

Answer:

B. It transmits an electrical message