Blood vessels are basically tubular organs found within other organs. Biology Reference states the same: Even the glands within the integument can be considered organs; any gland is primarily secretory epithelium surrounded by connective tissue for support and protection. They are part of organ system.
Why are veins known as capacitance vessels?
Veins are also called capacitance vessels because they contain 60% of the body’s blood volume. In systemic circulation, oxygenated blood is pumped by the left ventricle through the arteries to the muscles and organs of the body, where its nutrients and gases are exchanged at capillaries.
How do cells form a tissue?
Transcript of Cells form tissues, tissues form organs, organs form systems. Cells form tissues, tissues form organs, organs form systems and systems form organisms Tissues are made up of similar cells that carry out a common function. For example, muscle tissue is made up of many muscle cells grouped.
What is an organ made up of?
Organs are composed of main tissue, parenchyma, and “sporadic” tissues, stroma. The main tissue is that which is unique for the specific organ, such as the myocardium, the main tissue of the heart, while sporadic tissues include the nerves, blood vessels, and connective tissues.
What is the function of the epithelial tissue?
Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing. Epithelial layers contain no blood vessels, so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane.