no
Diffusion
There is no anatomical connection of circulatory system with the respiratory system. Blood capillaries come in close contact with the lung alveoli. The area of contact is about 1000 square feet. But there are two thin membranes to separate blood and air. The walls of capillaries and the walls of alveoli. Both have flat and thin epithelium. The gases readily pass across these membranes.
Fudi
There is no anatomical connection of circulatory system with the respiratory system. Blood capillaries come in close contact with the lung alveoli. The area of contact is about 1000 square feet. But there are two thin membranes to separate blood and air. The walls of capillaries and the walls of alveoli. Both have flat and thin epithelium. The gases readily pass across these membranes.
Osmosis is the water molecules diffusion across the cell membranes. More informations can be find at en.wikipedia.org/wiki/Diffusion
Gas exchanges occur by simple diffusion through the respiratory membrane -- oxygen passing from the alveolar air into the capillary blood and carbon dioxide leaving the blood to enter the gas-filled aveoli.
The organic molecule in cell membranes that permits the diffusion of lipid-soluble material is
Yes. Osmosis is a special case of diffusion - in involves just water diffusing across a semipermeable membranes - like in cell membranes.
In any living organism that needs to breath, the only thing consistently required for life is the presence of moist membranes. The movement of oxygen and carbon dioxide across the membranes between the environment and the respiratory surface occurs by diffusion. Respiratory surfaces are generally thin and, since living animal cells must be wet in order to maintain their plasma membranes, these respiratory surfaces must be moist.
Both have a high surface area for exchange: In the respiratory system the exchange of oxygen an carbon dioxide takes place between the alveoli and blood capillaries (both provide a high surface area for exchange) and in the digestive system, exchange of nutrients and waste takes place between the villi and blood capillaries (also both provide a high surface area for exchange) In both systems, transported materials pass through the membranes by a process called diffusion.
In this case, I am assuming that you are asking for the diffusion of digested food substances, namely fats, sugars (glucose)and amino acids. Firstly, the surface area of the small intestine is increased: 1. the inner walls of the small intestines have numerous folds 2. the inner walls of the small intestine are also lined up with numerous minute finger-like projections called villi. These villi further increase the surface area for absorption. 3. The epithelial cells of the villi, in turn, have numerous microvilli to further increase the surface area Secondly, the small intestine is super long, about seven metres in an adult. This provides sufficient time for the absorption of digested food substances. Thirdly, the aforementioned villi have thin walls or membranes (epithelium is only one cell thick) Fourthly, the intestinal wall and the villi have many capillaries to carry away the absorbed food substances. In each villus is a lacteal or lymphatic capillary surrounded by blood capillaries. The lymphatic capillaries of the villi transport fats while the blood capillaries transport amino acids and sugars away from the intestine. Glucose and amino acids are thus absorbed by diffusion into the blood capillaries of the villi. Do note that the rate of diffusion is affected by the speed of blood flow. Slower blood flow will impair diffusion due to gentler concentration gradient. Hope this helps. The information provided is from a Biology Textbook published from Marshall Cavendish Education, Singapore.
facilitated diffusion