21 of the most iconic photos ever taken. The image of a napalm scarred little girl running from her burning village in Vietnam is one of the most well known photographs in the world. Kim Phuc, the girl featured in the image, is now receiving free laser surgery to cover her scars, 40 years after that terrible day.
1 Oxygen: Specialized nerve cells within the aorta and carotid arteries called peripheral chemoreceptors monitor the oxygen concentration of the blood and feed back on the respiratory centers. 2  If the oxygen concentration in the blood decreases, they tell the respiratory centers to increase the rate and depth of breathing. This mechanism prevents damage to the lungs that would be caused by over-inflation. 2  Signals from higher brain centers: Nerve cells in the hypothalamus and cortex also influence the activity of the respiratory centers. 3  During pain or strong emotions, the hypothalamus will tell the respiratory centers to speed up.
Innervation of Lungs and Breathing. The pulmonary nerve plexus lies behind each hilum, receiving fibres from both vagi and the second to 4th thoracic ganglia of the sympathetic trunk. Each vagus contains sensory afferents from lungs and airways and bronchoconstrictor and secretomotor efferents.Sympathetic fibres are bronchodilator.Innervation of the lungs is via the pulmonary plexuses located anterior and posterior to the lung roots, innervating the smooth muscle of the airways and blood vessels, and glands of the bronchial tree.nnervation of the lungs is via the pulmonary plexuses located anterior and posterior to the lung roots, innervating the smooth muscle of the airways and blood vessels, and glands of the bronchial tree.