The divisions of the bronchial tree and its histological changes from main bronchus to segmental bronchus. Introduction: The lung is the principle organ of respiration. The main function of the bronchus is the exchange of gases such as oxygen and carbon dioxide. The bronchus is a main branch of air tube that enters the hilum of the lung. The main bronchus is 2 to 3 cm long which extends from the trachea or wind pipe. It extends to form roughly 65,000 terminal bronchioles. The right bronchus forms three branches – the superior, middle, and inferior bronchi. The left main bronchus forms two narrow branches – the superior and inferior bronchi.

Question

Want to see the full answer?

Answer 1

Question

Chapter 22.1, Problem 9AYLO

Summary Introduction

To discuss:

The divisions of the bronchial tree and its histological changes from main bronchus to segmental bronchus.

Introduction:

The lung is the principle organ of respiration. The main function of the bronchus is the exchange of gases such as oxygen and carbon dioxide. The bronchus is a main branch of air tube that enters the hilum of the lung. The main bronchus is 2 to 3 cm long which extends from the trachea or wind pipe. It extends to form roughly 65,000 terminal bronchioles. The right bronchus forms three branches – the superior, middle, and inferior bronchi. The left main bronchus forms two narrow branches – the superior and inferior bronchi.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

None

Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…

Question #5: Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The genes show independent assortment. Recessive alleles at both loci are required for the facultative apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C. At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype. A facultative apomict male, capable of producing viable pollen, was crossed with a sexually reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following temperatures*: a) 15°C? b) 25°C? *for full credit, show crosses and genotypes where appropriate. Remember to position the female first (left side) in the cross. Type your answer here: