Alveolus a. Alveoli are microscopic air sacs located in the lungs on the tips of the bronchioles composed of squamous epithelial tissue. About 300 million of them are located in the lungs. An alveolus is about 200 µm in diameter. The alveoli are covered with a fluid named surfactant, which plays a role in decreasing the surface tension of the alveoli. This is critical in during inhalation, because it is easier to fill a sac with a …showed first 75 words of 1666 total…

…showed last 75 words of 1666 total…where it was going. This is inefficient. Having a long axon allows for quick communication to areas away from the spinal cord, such at the feet. Also, having a short dendrite is good because it allows the signal to quickly get to the nucleus of the neuron and be dealt with there. The length of the dendrites and axons allow for quick and efficient transmission of signals from the brain to anywhere in the body.