The statement above is talking about the Drive Reduction Theory. This theory, proposed by Clark Hull in 1943, talks about a certain drive that develops when a disturbance occurs in an individual's homeostasis or simply put, when someone has physical needs that need to be met.
The definition of direction of impulse is the direction that impulse flows through a neuron. An important thing to remember is that the nerve impulse can only travel in one direction.
There are 4 parts of nerve cells; cell body, an axon, synaptic end bulbs, and dendrites.
The dendrites receive the impulses and the axon sends the impulse to other neurons.
The Maya adapted to the environment by having deer and monkeys as food. Trees and other plants were also good building materials. The Maya built structures such as large public meeting spaces, canals to control the flow of water, and fashioned nearby hills into flat terraces on which peasants could farm.
