What are the tiny balloon-like structures located at the end of the smallest tubes in the human lungs called?
Alveoli
Air inhaled through the trachea enters the two bronchi, which branch repeatedly into ever-narrower bronchioles inside each lung.
At the tip of the finest bronchioles sit clusters of tiny thin-walled sacs shaped like microscopic balloons; these are the alveoli, and their moist walls and dense capillary meshwork allow rapid diffusion of oxygen into the blood and carbon dioxide out of it.
Bronchi and bronchioles are only conducting tubes, not sacs, while villi are finger-like projections of the small intestine that absorb digested food, so they are not part of the lungs.
Hence, the tiny balloon-like structures at the end of the smallest tubes in the lungs are called alveoli.
Similar Questions
Which part of the human brain controls thinking and learning abilities of a person?
Which type of blood vessel is best suited for rapid exchange of gases and nutrients with body tissues?
Which part of the human eye controls the amount of light entering the eye?
Why is the small intestine able to fit into a compact space within the human body?
Why does the sight of or thought of delicious food make our mouths "water"?
Which acid does our stomach produce and what is its pH?
Which defect occurs when the eye lens loses its ability to focus on near objects due to decreased flexibility?
In human beings, the respiratory pigment that carries oxygen is ______.
Which gas is essential for aerobic respiration in animals?
Match 'Column A' with 'Column B' in context of the muscular layers in blood vessels.
Column A Column B (a) Thick tunica media (i) Vein (b) Smallest vessel diameter (ii) Artery (c) Large lumen (iii) Capillary (d) Endothelium (iv) All blood vessels
Important Questions from Human body
A resting person, usually has a pulse rate between ______ and ______ beats per minute
In humans, neck and head are joined by which joint ?
The human skeleton is composed of around ______ bones at birth.
At which period of life, body undergoes changes leading to reproductive maturity?
Milk is no longer called a balanced diet due to the lack of which one of the following?
