Comparison of the avian 'unidirectional' respiratory system (a) where gases are exchanged between the lungs and the blood in the parabronchi, and the bidirectional respiratory system of mammals (b) where gas exchange occurs in small dead-end sacs called alveoli (From: West et al. 2007).s a result, air coming into a mammal's lungs is mixed with 'old' air (air that has been in the lungs for a while) & this 'mixed air' has less oxygen. So, in bird lungs, more oxygen is available to diffuse into the blood (avian respiratory system).
The Power of Sympathy or The Triumph of Nature (1789) is a cautionary novel by William Hill Brown (1765-1793). It is based on an actual case of seduction and incest in col â¦ onial America. It is considered by many to be the first American novel.
Pity is less engaged than empathy, sympathy, or compassion, amounting to little more than a conscious acknowledgement of the plight of its object. Sympathy (âfellow feelingâ, âcommunity of feelingâ) is a feeling of care and concern for someone, often someone close, accompanied by a wish to see him better off or happier. Compared to pity, sympathy implies a greater sense of shared similarities together with a more profound personal engagement.