How many types of regeneration are there?
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Regeneration is of three types,
Physiological Regeneration
There is a constant loss of many kinds of calls due to wear and tear caused by day-to-day activities. The replacement of these cells is known as physiological regeneration
Example:
Replacement of R.B.C's
The worn out R.B.C's are deposited in the spleen and new R.B.C's regularly produced from the bone marrow cells, since the life span of R.B.C's is only 120days.
Replacement of Epidermal Cells of the Skin
The cells from the outer layers of epidermis are regularly peeled off by wear and tear. These are constantly being replaced by new cells added by the malpighian layer of the skin.
Reparative Regeneration
This is the replacement of lost parts or repair of damaged body organs. In this type of regeneration, wound is repaired or closed by the expansion of the adjoining epidermis over the wound.
Example:
Regeneration of limbs in salamandersRegeneration of lost tail in lizardHealing of woundReplacement of damaged cells.
Autotomy
In some animals like starfish, some part of the body is broken off on being threatened by a predator. This phenomenon of self-mutilation of the body is called autotomy
Example:
Crabs break off their leg on approaching of the enemyHolothurians throw off their internal visceraStarfish breaks off an arm
Physiological Regeneration
There is a constant loss of many kinds of calls due to wear and tear caused by day-to-day activities. The replacement of these cells is known as physiological regeneration
Example:
Replacement of R.B.C's
The worn out R.B.C's are deposited in the spleen and new R.B.C's regularly produced from the bone marrow cells, since the life span of R.B.C's is only 120days.
Replacement of Epidermal Cells of the Skin
The cells from the outer layers of epidermis are regularly peeled off by wear and tear. These are constantly being replaced by new cells added by the malpighian layer of the skin.
Reparative Regeneration
This is the replacement of lost parts or repair of damaged body organs. In this type of regeneration, wound is repaired or closed by the expansion of the adjoining epidermis over the wound.
Example:
Regeneration of limbs in salamandersRegeneration of lost tail in lizardHealing of woundReplacement of damaged cells.
Autotomy
In some animals like starfish, some part of the body is broken off on being threatened by a predator. This phenomenon of self-mutilation of the body is called autotomy
Example:
Crabs break off their leg on approaching of the enemyHolothurians throw off their internal visceraStarfish breaks off an arm
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