Respiration in mollusca , long qustion answer in simple word in +3 zoology students.

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↞RESPIRATION   IN   MOLLUSCA


- Mollusce is a large phylum of invertebrate animal.
- Mollusca are the largest marine phylum about 23% of all merine organism .
              The respiration bring about the utilization of O2 whitin the body                 and given out of CO2 outside.
- Respiretory organ in mullusca, these are,

CTENIDIA
- Ctenidia are the organs of aquatic respiratory and  it is present in aquatic mollusca.
- The pulmonary chamber is the organ of aerial respiration and is present in terrestrial mollusca.
- But in certain cases in pila , planorbis etc, both methords of respiration are used .
- It is simplest methord in mollusca.
- Ctenidia respiration through skin.

 STRUCTURE  OF  CTENIDIA
- The ctenidium has a cintrol axis one or two rows of filamets.
- The entair gill is sourounded by cilia.
- The ctenidium receives venous blood through an affarent branchial vein and after the oxygenation , back through efferent branchial vein.

NUBERS OF GILLS;
The number of gill is vary from 1-80 in different classes of mollusca.

TYPES  OF GILLS
In mollusca following types of ctenidia are seen.

1. MONOPENTINATE
-  This type of gill filament arrenged in a single row or one side of the axis.
EX- Pila

2.BIPECTINATE
-  This type of gills filament arrenged in a two rows on thr side of central axis.
EX- Mytilus

3.PLICATE  GILLS
- These are transvers folds of integument.

4.HOLOBRANCHS
-  In mollusca the ctenidia extend all over the body such gill are called holobranchs.
EX- Chitten , Patella

5.MEROBRANCHS
-  In mollusca the ctenidia extended a particular area of the body is called as merobranchs.

6.SECONDARY  GILLS
-  In some mollusca true gills are absent but certain other stracture function as gill is called as secondary gills or adoptive gill.
-  They are the following,
a. Anal gills- gills present around the anus.
b. Cerata- these are cylindrical vascular body located on the dorsal surface.
c. Pallial gills- Gills arranged in single row around the foot.
MECHANISM  OF  AQUATIC  RESPIRATION
-  The movement of water is effected through the mantle cavity the beating of cilia.
-  Each ctenidium contain both afferent and efferent blood vessels.
-  The ctenidium receives deoxygenated blood from body of animal through the efferent blood vessel.
PULMONARY  RESPIRATION:
-  Polmonary sac or longs present in terestirial or land mollusca.


-  When the pulmonary sac is used for respiration, this respiration is called as pulmonary respiration.
-  Polmonary sac is back like structure found in mantle cavity.
-  Mantle cavity by a opening is called polmonary aperrature.
-  The wall of polmonary sac reachly supplied with blood vessels.
MECHANISM IN   POLM ONARY   RESPIRATION
-  In respiration air is used.
-  Air entar the polmonary chamber through left pseudopodium.
-  During contration of air ,air passes into polmonary chamber from polmonary from pomonary sac.
-  The blood of polmonary sac take in o2 fom air at given out co2.
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*      Prof.- Dr ramakant pradhan

→best of luck for your exam , you study and ask u dout or other wise doubt in other long question in biology ask me in comment box .ok  student by.

Comments

  1. Unknown27 March 2020 at 12:22

    Describe about Mitosis and meosis

    ReplyDelete
  2. Unknown27 March 2020 at 12:23

    Excretion in annelida

    ReplyDelete
  3. Unknown5 April 2020 at 17:28

    Iske badd trachial respiration nahi hai..usko skeep kardiye kya?

    ReplyDelete
  4. Unknown8 April 2020 at 07:10

    Wording mistake rahuchi

    ReplyDelete
  5. Unknown15 April 2020 at 11:35

    Nice sir.sir send all long questions in internet to avoid chochings

    ReplyDelete
  6. Udit Barik27 May 2020 at 00:18

    Evolutionary significance of onychophora

    ReplyDelete

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