0
Why is alveoli covered by moist film and surrounded by capillaries?
Wiki User
∙ 12y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What are the characteristic of alveoli in the lungs?
Large surface area due to the combined spherical shape (600 million alveoli = 80 m2) Flattened epithelial cells of alveoli and close association with capillaries Short diffusion distance from alveoli to blood (0.5-1.0 um) Dense capillary network Moist surface for the solution of gases
How do alveoli and capillaries help to get oxygen?
The alveoli is the point where the waste product of respiration (carbon dioxide) and oxygen are diffused into or out of the blood. Oxygen diffuses into the blood stream and are carried to the heart and carbon dioxide is diffused out of the lungs and expired. The alveoli have moist walls and are close to the capillaries which speeds up the process.
Why do gas exchange surfaces need to be moist?
The gases are to dissolve and diffuse through.
Why does gas exchange take place at the alveoli?
The alveolus is a very thin walled structure that allows the gases to cross easily. This is assisted by the presence of surfactant a substance that reduces the surface tension in the alveolus making it even easier to cross.
Adaptive feature of trachea and alveoli?
Trachea have cartillage rings which support it. And the Alveoli has large surface area for diffusion and its moist and thin.
The thin moist membrane through which humans exchange gases is found in the what?
alveoli
What are element of respiratory system?
1) Nasal passage- This is your nose. Air enters here and is moistened, warmed, and cleaned. 2) Trachea- Your windpipe. It is held open by rings made of cartilage. Air passes through here. 3) Bronchi- Two tubes that branch from your Trachea. They each lead to a lung. 4) Bronchioles- Smaller branches coming from the Bronchi. 5) Lungs- An organ containing alveoli. 6) Alveoli- The smallest working part of the respiratory system, and the respiratory surface. They are moist and one-cell thick and are surrounded by capillaries for call exchange. That's about it :)
What is the structure of the alveolus?
wankeruh no.Alveoli are arranged in grape-like clusters, they have thin walls, covered in blood capillaries, the walls are moist, and they contain stretch receptors. http://www.coolschool.ca/lor/BI12/unit11/U11L03.htm
How are alveoli adapted for their function?
The site of gaseous exchange in mammals is the epithelium of the alveoli. To enable efficient gaseous exchange the alveoli have a number of adaptations to make them fit for purpose. Since gaseous exchange in mammals is reliant on diffusion and diffusion is proportional to: Surface area x difference in concentration _______________________________________ Length of diffusion path The alveoli are adapted for gas exchange in three main ways: 1) A thin exchange surface- the alveolar epithelium and the endothelium of the capillaries which surround the alveoli are only one cell thick each which means there is a very short diffusion pathway which allows for a fast rate of diffusion. The diffusion pathway is shortened further as the distance between the alveolar air and red blood cells is reduced as the red blood cells are flattened against the capillary walls. The alveolar epithelium is also partially permeable which allows specific substances to diffused through easily. 2) The alveoli are covered in a series of blood vessels and capillaries which mean that the gasses can diffuse directly into the bloodstream. The action of the heart constantly circulated the blood through the capillaries surrounding the alveoli in the lungs and this blood Flow through the capillaries maintains a steep concentration gradient. Once oxygen has diffused into the blood, it is removed from the site of diffusion by the constant blood flow and replaced with de-oxygenated blood flowing through. Red Blood cells are also slowed as they flow through the capillaries, this allows more time for the gases to diffuse across the alveolar epithelium and the endothelium of the capillaries. 3) There are about 300 million alveoli is each human lung, their total surface area is about 70m�² (about half the size of a tennis court) a large surface area, means that the gas exchange is more efficient as there is more opportunity for diffusion to take place. and increase the space in lungs
What word starts with an x and has to do with Mesopotamia?
Xeric- an environment or habitat that has moist conditions, Mesopotamia was in moist conditions surrounded by the Tirgris and Euprates rivers. :) hope this helped (:
What does the alveolus do in the respiratory system?
The alveoli in the lungs are basically like "air sacs" and look like bunches of grapes in diagrams. They basically are VERY tiny and create a large surface area for the lungs where gas exchange can occur (oxygen enters the blood, CO2 enters the alveoli). They are very efficient because - they are only one cell thick (so they the gases can cross, or DIFFUSE, easily) - they are moist (to stop friction and let diffusion occur quickly) They are covered in tiny blood vessels called capillaries (so more blood gets oxygen faster) - they are nearly if not totally microscopic (so there are MILLIONS of them) I hope this helps!!
What word starts with an x and has to do with ancient mesopotamia?
Xeric- an environment or habitat that has moist conditions, Mesopotamia was in moist conditions surrounded by the Tirgris and Euprates rivers. :) hope this helped (:
