Calf Muscles. 1  The calf muscles are six in number: the gastrocnemius, the soleus, the popliteus, the tibialis posterior, the flexor digitorum longus, and the flexor hallucis longus. 2  The gastrocnemius and the soleus run between the knee and the ankle. 3  One of the calf muscles, the soleus, has a special ability.
Air pollution leads to ozone pollution and acid rain. CFC compounds, used in aerosol sprays prior to 1995, destroy the ozone layer. Ozone pollution can cause damage to human respiratory tracts. Ozone can damage the vascular system of plants.
Ozone is an air pollutant that can damage human health, vegetation, and many common materials. It is an ingredient of urban smog. Unlike most other air pollutants, ozone is not directly emitted from any one source. Ozone is formed near the surface by the interaction of sunlight, with hydrocarbons and nitrogen oxides.