The structures with a diameter less than 1 mm are:
Correct answer: A. Bronchioles
- A. Bronchioles
- B. Bronchi
- C. Alveoli
- D. Air sac
Explanation
The part of the respiratory system that has the thinnest wallwal and also the smallest diameter is bronchiole. Bronchioles are branches of bronchi and end off in alveoli. They contain no hyaline cartilage and are mainly surrounded by smooth muscle and elastic fibres.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
Practise Respiration
446 free Respiration MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Respiration questions
The bronchi divide into the lungs and make fine tubes that are termed as:
Mild wheezing, Fever, chills, and shortness of breath; all are symptoms of:
What is the breathing rate in humans during exercise?
The cartilage protects the trachea from:
The fibrous bands that are stretched across the voice box are known as:
A surfactant plays its role by: