Indirect contact includes airborne transmission, object contamination, food and water contamination and human-to-animal exchange. Examples of direct contact include human touch and spray or exchange of bodily fluids.Continue Reading
Direct and indirect contact refer to the transmission of infectious diseases. Not all diseases are contagious by both direct and indirect contact. Some can only be contracted through direct contact. The exchange of bodily fluids, such as saliva or blood, is considered direct contact because an infected element of one person's body is directly coming into contact with another. This is also why spray, such as sneezing, is considered direct contact. Even though a person who sneezes does not directly touch another, it is still possible for the exchange of bodily fluids to take place through spray.
Indirect contact refers to a person who contracts a disease without coming into direct contact with the infected person or the infected person's bodily fluids. Some diseases are actually airborne diseases, meaning a person can infect those around him just by being in the same space. It's also possible to catch a disease that is transmitted indirectly by touching an object that an infected person has touched. Some bacteria do not immediately die and actually multiply on surfaces, particularly surfaces that are unclean. Being bitten by an insect or animal that has been infected can cause someone to contract a disease, as can drinking or eating contaminated food.Learn more about Biology
Gaseous exchange occurs in the alveoli by simple diffusion. The blood flowing past the alveoli is rich in carbon dioxide and very poor in oxygen. The gas molecules naturally flow in the direction of lower concentration through the thin gas exchange membrane, which is only two cells thick.Full Answer >
A few examples of biomimicry include the inventions of Velcro, passive cooling and self-healing plastic. Biomimicry is the process of taking an example from nature and using it to engineer devices and create applications that solve human and world problems.Full Answer >
Seashells are made when marine mollusks such as snails, clams and oysters secrete minerals and proteins through their mantle, which is the outermost part of their body that comes in contact with the shells. Shells are made mostly of calcium carbonate; less than 2 percent of their mass is made of proteins. There are no living cells in shells. Shells are usually formed in three layers, which have distinct structures.Full Answer >
Mold growth in a house is caused when mold spores come into contact with a wet surface, according to the Environmental Protection Agency. This is a constant for all the different forms of mold.Full Answer >