About ______ per cent of CO2 is carried in a dissolved state through plasma.
2 of 15
As you have read earlier, oxygen (O2 ) is utilised by the organisms to ______ break down simple molecules like glucose, amino acids, fatty acids, etc., to derive energy to perform various activities.
3 of 15
Carbon dioxide which is harmful is also released during the above ______ reactions
4 of 15
O2 has to be continuously provides to the cells & CO2 produced by the cells have to be released out . This process of exchange of O2 from atmosphere with CO2 produced by cells is called ______, commonly known as respiration .
5 of 15
Mechanisms of breathing vary among different groups of animals depending mainly on their ______ & level of organisation.
6 of 15
Lower invertebrates like ______, coelenterate, flatworms, etc. exchange of O2 with CO2 by ______ over entire body surface .
7 of 15
Earthworms use their moist cuticle and insects have a network of tubes ( ______ ) to transport atmospheric air within the body.
8 of 15
Special vascularised structures called gills (branchial respiration) are used by most of the aquatic ______ and ______
9 of 15
Vascularised bags called lungs ( ______ respiration) are used by the terrestrial forms for the exchange of gases.
10 of 15
Among vertebrates, fishes use gills whereas amphibians, ______, birds and mammals respire through lungs.
11 of 15
Amphibians like frogs can respire through their moist skin ( ______ respiration) also.
12 of 15
We have a pair of external nostrils opening out above the upper lips. It leads to a ______ through the nasal passage.
13 of 15
The nasal chamber opens into the ______, a portion of which is the common passage for food and air.
14 of 15
The pharynx opens through the larynx region into the ______
15 of 15
Larynx is a ______ box which helps in sound production and hence called the sound box
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