Read the following statements :A) Mammalian lungs are solid and spongy

1.	Read the following statements :A) Mammalian lungs are solid and spongyB) In embryo state breathing rate and residual air are absentC) Residual volume is expelled only by force full expirationD) Partial pressure of oxygen in expired air is more than in inspired airHow many statements are correct ?1. 3 2. 43. 24. 1
Answer» I think that option 4 is correct because mammalian lungs are not solid(they contain air sacs = alveoli) but they are spongy, statement 2 is correct for that you have to read sub-topic circulation in foetus of std 12 combining with concepts of respiration and circulation of std 11 statement 3 is wrong as residual volume is never expelled out of body,we can expell on expiratory reserve volume through forceful respiration as if we expire RV then there will be vacuum created in lungs and they will collapse statement 4 is also wrong

Read the following statements :A) Mammalian lungs are solid and spongyB) In embryo state breathing rate and residual air are absentC) Residual volume is expelled only by force full expirationD) Partial pressure of oxygen in expired air is more than in inspired airHow many statements are correct ?1. 3 2. 43. 24. 1

Answer»

I think that option 4 is correct

because mammalian lungs are not solid(they contain air sacs = alveoli) but they are spongy,

statement 2 is correct for that you have to read sub-topic circulation in foetus of std 12 combining with concepts of respiration and circulation of std 11

statement 3 is wrong as residual volume is never expelled out of body,we can expell on expiratory reserve volume through forceful respiration as if we expire RV then there will be vacuum created in lungs and they will collapse

statement 4 is also wrong

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