MCQ
Trachea divides into bronchi at:
- A4th thoracic vertebra.
- B5th thoracic vertebra.
- C6th thoracic vertebra.
- D7th thoracic vertebra.
Explanation:
Trachea is a straight tube extending up to the mid-thoracic cavity. It divides into bronchi at 5th thoracic vertebra.
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$I.$ Occurs between $G_1$ and $G_2$
$II.$ $DNA$ replication begins in the nucleus
$III.$ Centrioles duplicate in the cytoplasm
$IV.$ As $DNA$ s doubled, number of chromosomes also doubles Option are
Options:
$II.$ Increased partial pressure of $CO _{2}$
$III.$ Increased partial pressure of $H^{+i i}$
$IV.$ Decreased partial pressure of $O_{2}$
All the above situations favours the dissociation of oxyhaemoglobin except