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Name of the college: New B.Ed College Nellimoodu

Name of the student: Aswathy.T.S.

Option : Natural scienceRegister number :181/13376007

Topic : Respiration in animals

Standard : IX

Subject : Biology

RESPIRATION

Respiration is defined as the transport of oxygen from the outside air to the cells within the body .

HUMAN BEINGS

Lungs are the respiratory organ of human beings.

Air enters through nostrils.

Alveoli is inside the lungs.

Alveoli increase the surface area of the lungs.

RESPIRATORY ORGANS IN ANIMALS

AMOEBA ( Cell membrane) EARTHWORM ( Skin) INSECTS ( Trachea) SPIDER ( Book lungs) FISH ( Gills) FROG (Moist skin, buccal-

cavity,lungs) HUMAN BEING (Lungs)

AMOEBA

Cell membrane act as the respiratory organ .

Oxygen enters and carbon dioxide leaves out through this membrane

EARTHWORM

Skin is the respiratory organ of earthworm.

Oxygen from the atmosphere diffuses into the blood.

Carbon dioxide from the blood diffuses out to the atmosphere through the moist skin.

INSECTS

Trachea is the respiratory organ of the insects.

It is open to the outside through opening called spiracles.

Air enters through this openings.

Oxygen diffuses directly into the tissue.

SPIDER

Book lungs are the respiratory organ of the spider .

They are seen towards the posterior end of the abdominal cavity.

Book lungs is filled with body fluid.

Oxygen dissolves into the body fluid.

Carbon dioxide is expelled from the body fluid.

FISH

Gills are the respiratory organ of the fish.

Oxygen from the water flows through gills.

Oxygen diffuses into the blood and carbon dioxide diffuses into the water through gills.

FROG

Frog can breathe both in air and water.

Moist skin, buccal cavity and lungs are the respiratory organs of frog.

Tadpoles, larvae of frog breathe through gills.

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