Why does Human die?

Bacteria grow old and then

divide, not die

Bacteria are said to be biologically immortal

But human cell loses division ability after 50-60

round

Why?

Telomere of chromosome

gets little shorter with

every division

Telomere

Telo

mer

e

Telomere protects end of chromosome and stop it from merging with its

neighbor

So, length of telomere gets little shorter after every

division

Our body cell can’t produce

telomerase enzyme to restore telomere length after every

division

But why our cells have to die?

Our cell is chemical plant where many reaction happening every moment.

Sometimes harmful substance, free radicals get produced as byproduct

Give us

electrons!Free radical reacts with

many important chemicals to get electrons and turn them into useless substances.

Antioxidant can neutralize free radicals by giving them electrons

Vitamin C

Source of antioxidants

Even antioxidants

can’t make you immortal!

Nerves, most of muscles can’t divide, so maintaining those is

hard stuff

Lysosome digests debris inside cell to maintain health of

cell

But indigestible debris get accumulated in lysosome and it becomes useless and cell dies

Nothing can make you immortal, so live

the time you have