What are the potential effects of high doses of radiation?

High doses of radiation can lead to several serious biological effects, primarily including an increased risk of cancer, tissue damage, and genetic mutations. When human cells are exposed to radiation at high levels, they may suffer from DNA damage. This damage can lead to the uncontrolled growth of cells, which is a hallmark of cancer. Additionally, tissue damage can occur because radiation has the potential to kill or alter the cells that compose various tissues and organs, impairing their normal function.

Genetic mutations may arise from the altered DNA, which can be passed down to future generations if the mutations occur in germ cells (sperm or eggs). These mutations can result in inherited genetic disorders or an increased susceptibility to certain diseases, thereby affecting the health of offspring.

Other choices do not correctly reflect the consequences of high radiation exposure. For instance, increased risk of cavities and decreased dental health would primarily stem from poor oral hygiene or other factors, not directly from radiation. Improved healing rates is also inaccurate, as high doses of radiation typically impede the body's ability to heal due to the damage inflicted on healthy cells and tissues. Thus, option C accurately describes the potential effects associated with high doses of radiation.