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Frog Respiratory System Short Notes

In this article we will discuss about the frog respiratory system

Frog Respiratory System

The process of gaseous exchange is called respiration
The frog respiratory system help for respiration
The frog respiratory system different in adult and larva
Branchial respiration occurs in case of tadpoles by means of external gills
Respiration in adult frog occurs through 3 different ways
1. Cutaneous respiration: through moist surface of outer skin.
2. Buccal respiration: through lining of bucco pharyngeal cavity.
3. Pulmonary respiration: through lungs.

Cutaneous Respiration in Frog

The respiration through skin is called cutaneous respiration
The frog is under water or hibernating, it is the only mode of respiration
The skin of frog is thin and has fine blood vessels
Due the presence of mucous gland the skin of frog always remains moist
During gaseous exchange the oxygen first dissolve moisture of body and then diffuse into the blood capillaries
The carbon dioxide diffuses out from the blood into the environment
Movement is not required in cutaneous respiration as skin remains exposed to air or water

Buccal Respiration in Frog

Respiration done through the buccopharyngeal cavity then it is called buccopharyngeal respiration
The floor of the buccal cavity is alternately raised and lowered
The buccal cavity consists of moist mucous membrane and richly supplied with blood capillaries
The air enters into the cavity through external nares and gaseous exchange takes place through the lining of buccal cavity
The glottis closed during buccal respiration

Pulmonary Respiration in Frog

The respiration through the lungs is called pulmonary respiration
Frog respires by lungs when the need for oxygen is great
Passage through which the air enters and leaves the lungs is termed as respiratory tract
Respiratory tract consists of nostrils, buccopharynheal cavity, glottis, bronchi and lungs
Nostrils: A pair of external and internal nostrils present
Buccopharynheal cavity: the space between buccal cavity and pharynx
Glottis: A slit like opening
Bronchi: it is a pair of small tubes
Lungs: pair of sacs. Numerous small air sacs are present in the lungs called alveoli. Alveoli help for gaseous exchange.

How Respiratory System Works In Frog?

The inspiration and expiration of the air is done by the action of the buccal cavity

Inspiration

The process of intake of air is called inspiration
Now, the sternohyal muscles contract.
The floor of buccal cavity is lowered
Buccal cavity is enlarged and the air is drawn into the buccal cavity through the nostrils
Now, the glottis opens and the closes the nostrils
The pterohyal muscles contracts which raises the floor of buccal cavity
By this mechanism the air passed into lungs
In lungs, alveoli are filled with air and gaseous exchange takes place between blood and alveoli by diffusion.

Expiration

The process of exhaling of CO2 is called expiration.
The glottis closes when lungs are filled with air
Soon, the glottis opens.
The air in the lungs are driven out into the buccal cavity by lowering its floor
The glottis closes when the buccal floor is raised again.
Now, the air is expelled through the opened nostrils to outside.

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