Match the following terms describing the physical/mecahnical events with the correct phases of the cardiac cycle. each phase may be used more than once. all 4 cardiac valves are closed and all 4 chambers are relaxed during this phase. the maximum amount of blood is in the ventricles at the end of this phase. the pressure in the ventricles is higher than in the atria, but lower than in the arteries, during this phase. the semilunar valves are open and the av valves are closed during this phase. the atria contract at the end of this phase. the pressure in the ventricles is higher than the pressure in both the atria and the arteries during this phase. systole begins with this phase. a) isovolumetric contraction b) isovolumetric relaxation c) ventricular filling d) ventricular ejection
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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.
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If human development really does proceed continuously, what value does stage theories of development have?
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Match the following terms describing the physical/mecahnical events with the correct phases of the c...
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