True or false anaerobic exercise requires oxygen true false the two types of vitamins are fat and water soluble true false lactic acid is produced during low-moderate exercise true false the formula for your maximum heart rate is 220-age true false fitt stands for frequency, intensity, time and type true false metabolism is converting food into energy true false aerobic exercise doe not require oxygen true false carbohydrates are the bodies main source of fuel true false anaerobic exercise is exercise in short bursts true false target heart rate is your ideal heart rate during exercise true false

Hyperextension vends a joint in the opposite directions as flexion. true or false

List three reasons people may begin using tobacco

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles.b) the viral genome codes for specialized enzymes not in the host.c) the virus infects only those cells and species that can perform all the replication roles necessary.d) viruses can stay in a quiescent state until the host cell evolves this ability.