The Epidermis is the outermost, Avascularized (lacks blood vessels), protective layer.
Its composed of Keratinized Stratified Squamous Epithelial Cells.
connective tissue
The connective tissue that contains fluid and lacks fibers is called loose connective tissue. This tissue is found throughout the body and acts as a supportive framework for organs and blood vessels while allowing for movement and flexibility. Examples include areolar and adipose tissue.
Smooth
The stomach and blood vessels are composed of smooth muscles.
The tissue in blood vessels is called elastic tissue as it have to control the pressure in blood and have to contract and relax to create a specific pressure so that every organ should receive blood.
Smooth muscle tissue causes vasoconstriction. This type of muscle tissue is found in the walls of blood vessels and is responsible for regulating blood flow by constricting and dilating the vessels.
Cartilage
Smooth tissue refers to a type of tissue that lacks striation and is typically found in organs like blood vessels and the digestive tract. Muscle tissue encompasses three types: skeletal muscle, cardiac muscle, and smooth muscle. Smooth tissue is a specific type of muscle tissue known as smooth muscle tissue.
The connective tissue type found in the walls of large blood vessels and in ligaments supporting transitional epithelia is elastic connective tissue. This type of tissue is rich in elastin fibers, allowing it to provide flexibility and resilience, enabling blood vessels to stretch and recoil with blood flow. Additionally, it helps maintain the structural integrity of ligaments associated with transitional epithelium.
Connective tissues vary in their vascularity, meaning some types have blood vessels while others do not. For instance, dense connective tissues like tendons and ligaments have a limited blood supply, while loose connective tissues, such as areolar tissue, are more vascularized. Cartilage, another type of connective tissue, is avascular, relying on diffusion for nutrient supply. Therefore, the presence of blood vessels in connective tissue depends on the specific type of tissue.
The type of connective tissue that has a fibreless matrix is known as "embryonic connective tissue," specifically the gelatinous substance called "mucous connective tissue" or Wharton's jelly. This type of tissue is primarily found in the umbilical cord and serves to support and protect the blood vessels. Its matrix is rich in ground substance but lacks the prominent fibers seen in other connective tissues, making it unique in structure and function.
Endothelial tissue forms the inner lining of blood vessels. This thin layer of cells plays a crucial role in regulating vascular tone, blood flow, and the movement of substances between the bloodstream and surrounding tissues.