Fill in the Blank with Words from Section 1

Short Answer

Fill in the blank with words from section 1.2 that complete this sentence.
Neurons are cells in the brain that use chemical and electrical signals to communicate. An electrical signal known as an ________________________ travels along the __________________________ of a neuron. The signal is then communicated to the next cell via chemical _________________________ which cross the _______________________ and are detected by molecular receptors on dendrites.