The secretory ducts of mammary glands are lined by which type of epithelium?

Tissue is defined as:

The intestine and stomach in humans is lined by$:-$

The germinal layer of keratinized stratified squamous epithelium is:

The inner lining of blood vessels is known as:

Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.