What are the constituent parts 

(limbs and the organs)

 that the baby infant gets

inherited  from his/her parents ?

The Hindu Sacred Scripts like  Agama Sastras,

 mythologies etcs  say, because of the

 Karma phalam this human body is obtained.

“Jantunaam Nara Janma Durlabham”

 what Sri Adi Sankaracharya said.

Unless the man does the Punya Karma which is

 infinit (anantam) in the Poora Janmas

(previous births),  then only the human body

takes place which is superior to all other creatures.

 This Nara Janma is the supreme upadhi for

aboding the Moksha samrajyam which  is  Kaivalyam.

 With all his Viveka Vichakshana,  the man has to be

  in the non-duality state and come out of this wordly

 illusion and finally attains the Self Reliazation.

This human body is for the Narayana Seva what the scripts tell.

  Means the maanava seva yeva  Madhava seva.

The Jeevathma should  see all the other Athmas as Paramaathma.

The man should treat all other Athmas as like his own Jeevathama.

So,  in this materialistic world  , the man

has to act as a self less, service oriented,

sacrificing and devotional  feelings  and do his

Karma as the God has presented  this human body.

It is so easy to tell but in practice every thing is not possible.

 But  by constant rememberance  and by

 practice only the negativeness of maya can be taken away.

Mainly, foremost thing is that  the man has

to do many duties to his people at home.

Mainly first and first he has to do the service to his parents.

He should  patronage and protect his parents

 when once the man attains majority.

We  know the pregnant mother gives birth to a infant.

She takes every care of him, loves him

and sacrifice her life to him.

Like wise, the father also loves, sacrifice and

 make his son to be in a highest position in life.

What ever the comforts, luxuries, education, power,

money etc everything that has  come from his parents only.

This body consists of skin, blood, bones,

 flesh, intestines eyes, hands legs etc.,

But the Scripts say, in this body, the skin, the blood,

 the flesh, the navel, the heart, the small and large

 intenstines etc., have been received from ones own mother. 

Like wise, on the strength of  semen (suklam)

 the hair, eyes, nails, teeth, bones, the musles, the

nervous and others have been obtained from ones s own  father.

Because of that also, in the old age ( ripen age)

of their parents, every one has to become

as the  organs or constituent parts to

their parents  and lovingly and patiently one

has to do the service patiently to the parents.