The middle layer of a vein is called the tunica media. It is made of circularly arranged smooth muscle and connective tissue (with a lot of elastin and collagen).
bundle sheath
tunica externa
pay a attention in school you dummies
adventitia
xylem
The outer layer of the sun is called the corona.
Epidermis
corona is the outer most layer of the sun.
the capillaries are the most common blood vessel in the human body.
The tunica intima is the innermost layer of a blood vessel and is composed of endothelial cells. It functions in regulating blood flow and preventing blood clot formation.
Since we have an atmosphere that is made up of 4 layers. One the most outer layer the thermosphere. Then the 3 most outer layer is the mesosphere. Next is the Stratosphere the third most outer layer. Last the closest layer the Troposphere which is where we all live.
The outermost layer of the Earth's Atmosphere is the thermosphere.
corona is the outer most layer of the sun.
bark
The outermost layer of the Earth's Atmosphere is the thermosphere.
traphosphere
Epidermis