Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.
It’s the mucosa, not the submucosa.
The primary tissue of the tunica submucosa is loose connective tissue. This layer lies beneath the mucosa and contains blood vessels, lymphatic vessels, nerves, and glands that support the function of the mucosa.
The Submucosa.
None
None
The intramural plexus is found in the walls of organs, such as the gastrointestinal tract and urinary bladder. It consists of networks of autonomic nerves that regulate the function of these organs.
In the submucosa
Many arterioles that penetrate the Submucosa give rise to capillary networks that supply the Intestinal Glands and villi with blood.
Submucosa
The submucosa is composed of loose connective tissue containing blood vessels, nerves, and glands. It provides support and nourishment to the mucosa layer of the digestive tract.
The four histological layers of the gut are the mucosa, submucosa, muscularis externa, and serosa (or adventitia). The mucosa is the innermost layer, containing epithelial cells and glands. The submucosa provides support and contains blood vessels and nerves. The muscularis externa is responsible for peristalsis, and the serosa (or adventitia) is the outermost layer providing protection and support.
The human stomach has four layers. These layers are the mucosa, submucosa, muscularis, and serosa. Each layer serves a specific function in the digestion and movement of food within the stomach.