Resistance also influences total blood flow. resistance is defined as the amount of friction the blood experiences as it travels through the blood vessels. blood flow is always opposed by resistance. friction is due to the contact between blood and the blood vessel wall. the term peripheral resistance is typically used when discussing the resistance of blood in the blood vessels (as opposed to the resistance of blood in the heart). several factors affect this friction, including blood viscosity, blood vessel length, and the size of the lumen of blood vessels (as indicated by vessel radius)

Name the type of chemical that speeds up digestion

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

Do you think the gene eef1 alpha1 supports cell theory? explain your response.