One cell thick
The layers of the respiratory membrane include the alveolar epithelium, the basement membrane, and the capillary endothelium. These layers are involved in facilitating the exchange of gases, such as oxygen and carbon dioxide, between the air in the lungs and the blood in the capillaries.
Oxygen diffuses through two layers of cells: the alveolar epithelial cells lining the lung air sacs and the capillary endothelial cells before it reaches a red blood cell in the pulmonary capillaries.
In humans, the epidermis is four or five cell layers thick, depending upon the area of skin in question. There is the cornfield layer, the clear layer, granular layer, spinous layer and basal layer.
In a restricted ocean as opposed to a closed ocean, as the restricted ocean evaporates, more salty water enters from outside. This continuously replenishes the salt that is being deposited allowing for thick evaporate layers to form. Many examples actually show that the new water episodically enters the evaporating ocean.
A leaflet is typically one cell thick, allowing for efficient gas exchange and light absorption. However, some cell layers may be present in specialized structures like the palisade mesophyll for photosynthesis.
capillary walls are very thin, often a cell thick. artery walls have two thick layers.
500
they are one cell thick.
→ layers from alveolus to capillary ①surfactant layer (inside alveolus) ②pneumocyteⅠ(typeⅠ cell) layer ③fused basal lamina (consists of basal laminae of alveolar epithelium and capillary endothelium) ④endothelium (inside capillary)
I say thick because it's got many layers.
it is 7 layers
Quite Thin, As We Have 8 Layers Of Skin.
the crust is the thickness of earths layers
Penguins
That depends on how thick you paint, and how many layers of paint you use.
The smallest type of blood vessel is the capillary. Its walls are one cell thick and permeable, for substances to transfer out of the capillary and into the cells (and vice versa).
the correct answer is compactioncompaction