In Explaining Why People Age and Eventually Die, Dr Sithole

question 4

Multiple Choice

In explaining why people age and eventually die, Dr Sithole talks about 'free radicals' and how their buildup produces tissue damage. Dr Sithole is promoting a ____ theory of ageing.

• A)wear-and-tear
• B)metabolic
• C)cellular
• D)programmed cell death

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Definitions:

Crepuscular

Describing organisms that are most active during the twilight periods at dawn and dusk.

Circadian Rhythm

Circadian rhythm refers to the natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.

Long-Term Change

A significant modification or transformation that occurs over an extended period, impacting environments, societies, or biological evolution.

Learning

The process by which knowledge or skills are acquired as a result of experience; a change in the behavior of an animal that results from experience.