In ecological studies, carrying capacity can be described as the maximum number of organisms of a species that a particular area can hold.
Each area has certain amounts of resources to carry a specific number of individuals of a species. Beyond this capacity, resources begin to deplete and the organisms start fighting for the resources. As a result, their population declines.
The following graph shows that the forest habitat reached the carrying capacity for rats in the year 6 after which its population began to decline, instead of increasing.
The one which is responsible for transmitting an impulse across a synapse to another cell is the neurotransmitters. It allows the transmission of signals from one neuron to the next across synapses.
