Do You Really Have a New Body Every 7 Years?

The video debunks the myth that the human body replaces all its cells every seven years. It explains that while many cells do regenerate, the rate varies significantly across different cell types. Some cells, like those in the stomach, are replaced frequently, while others, like heart muscle cells, regenerate very slowly. Certain cells, such as neurons in the cerebral cortex, are never replaced. The video also discusses how carbon-14 from nuclear testing has helped scientists determine the age of cells by measuring its concentration in DNA, which remains constant throughout a cell's life.

What is the common myth about the human body's cell replacement?

• The body replaces all its cells every seven years.

• The body replaces all its cells every month.

• The body never replaces any of its cells.

• The body replaces all its cells every year.

Which type of cells are replaced most frequently in the human body?

• Bone cells

• Heart muscle cells

• Stomach lining cells

• Neurons in the cerebral cortex

Which cells in the human body are never replaced?

• Red blood cells

• Neurons in the cerebral cortex

• Skin cells

• White blood cells

How do scientists determine the age of cells using carbon-14?

• By counting the number of cell divisions

• By measuring the carbon-14 levels in the cell's DNA

• By measuring the amount of carbon-14 in the atmosphere

• By observing the cell under a microscope

What historical event contributed to the ability to date cells using carbon-14?

• The Industrial Revolution

• The invention of the microscope

• The discovery of DNA

• The Cold War nuclear tests