46.Postembryonic period. Old age and death.

Question 1

Postembryonic period

Answer 1

The postnatal period in humans is divided as follows:

Up to 1 year - infancy
Up to 6-7 years - childhood
Up to 13-15 years - adolescence
Up to 45 years - young age
Up to 60 years - active age
Up to 70 years old - old age
Up to 90 years old - old age
Over 90 years - longevity

Question 2

Aging, old age and death

Answer 2

Aging:

-Definition: Irreversible, genetic, time-related decline in function.
-Onset: Post-puberty, visible at 25-30 years.
-Process: Cell, tissue, organ aging.

Types:
-Physiological: Slow, illness-free.
-Premature: Due to disease, low immunity.

Death:
-Definition: End of development.
-Types:
–Physiological: Normal, irreversible.
–Premature: Due to disease, accidents.
—-Clinical: Reversible.
—-Biological: Irreversible.