If you mean what does a dendrite DO, it receives impulsesfrom other neurons via synapses.
If you mean something else, you may need to form your question better.
For instance, what do you mean by 'interaction'? Are you perhaps asking what happens at a dendritic spine as neurotransmitters diffuse to it?
If so, then what happens is that sodium-ion gates are opened, allowing sodium ions in, starting a graded impulse propagating toward the axon hillock, where it may summate to cause the action potential to fire in the axon.
dendrite
To "connect" two neurons, (or a neuron and a muscle cell), by providing a space between an axon terminal of one neuron and a dendrite of another neuron (or a muscle cell), so neurotransmitters that are released by an axon terminal can diffuse across that space to reach the dendrite (or muscle cell) and either initiate the possibility of the second neuron to fire or cause a muscle cell to contract.
The location of dendrite and axon: If dendrite and axon emerge from same process, the neuron is unipolar. If dendrite and a single axon emerge from opposite ends of the soma, the neuron is bipolar. If the neuron has more than 2 dendrite it is called multipolar.
dendrite
In a neuron, impulses move from dendrite to axon. These impulses carry energy to different parts of the neuron.
Receptive region of neuron-- bear receptors for neurotransmitters released by other neurons.
the longest dendrite is I don't know this /;[
When a message gets sent to a neuron from the dendrite it goes through the cell body to the tip of the dendrite where it leaps to the next dendrite.
The location of dendrite and axon: If dendrite and axon emerge from same process, the neuron is unipolar. If dendrite and a single axon emerge from opposite ends of the soma, the neuron is bipolar. If the neuron has more than 2 dendrite it is called multipolar.
dendrite
To "connect" two neurons, (or a neuron and a muscle cell), by providing a space between an axon terminal of one neuron and a dendrite of another neuron (or a muscle cell), so neurotransmitters that are released by an axon terminal can diffuse across that space to reach the dendrite (or muscle cell) and either initiate the possibility of the second neuron to fire or cause a muscle cell to contract.
a dendrite
Dendrite
The location of dendrite and axon: If dendrite and axon emerge from same process, the neuron is unipolar. If dendrite and a single axon emerge from opposite ends of the soma, the neuron is bipolar. If the neuron has more than 2 dendrite it is called multipolar.
Axon, nucleus, and dendrite
Soma, axon, dendrite
dendrite