17 - True, neurons are the most significant or basic unit for transferring nervous signals throughout the body. Nerves which are linked act as wires for connection. The brain wouldn't be able to send or receive signals if there were no neurons
18 - False, hormones are just chemical molecules or messengers that are sent towards tissues or organs through the bloodstream to help regulate the growth or metabolism through homeostasis process
19 - True, axons are the longest part of a neuron which helps for neurotransmission process throughout the whole nerve to the end of the motor neuron
