Digestive System Anatomy Mouth Food begins its journey through the digestive system in the mouth, also known as the oral cavity. Inside the mouth are many accessory organs that aid in the digestion of food—the tongue, teeth, and salivary glands. Teeth chop food into small pieces, which are moistened by saliva before the tongue and other muscles push the food into the pharynx. The teeth are 32 small, hard organs found along the anterior and lateral edges of the mouth.
December 21, 0 Comments Blood Vessels are often compared to a system of pipes with liquid circulating in them, but this analogy is only a starting point.
Unlike pipes, blood vessels are extremely dynamic structures that constrict, relax, pulsate, and proliferate. Blood vessels within the body form a closed delivery system that begins and ends at the heart. Structure and Function There are three major types of blood vessels: As the heart contracts, it forces blood into the large arteries leaving the ventricles.
Blood then moves into smaller arteries successively, until finally reaching the smallest branches, the arterioles, which feed into the capillary beds of organs and tissues. Blood drains from the capillaries into venules, the smallest veins, and then into larger veins that merge and ultimately empty into the heart.
If you stretched out all of the blood vessels in the human body, they would be ,00 km 60, miles long! In the systemic circulation, arteries always carry oxygenated blood and veins always carry oxygen-poor blood.
In the pulmonary circulation, the opposite is true. The arteries, still defined as the vessels leading away from the heart, carry oxygen-poor blood to the lungs, and the veins carry oxygen-rich blood fr Anatomy of a blood vessel wall.
The tunica intima, tunica media, and tunica externa om the lungs to the heart. The only blood vessels that have intimate contact with tissue cells in the human body are capillaries.
In this way, they help serve cellular needs. Exchanges between the blood and tissue cells occur primarily through the thin capillary walls. Structure of Blood Vessel Walls The walls of all blood vessels, except the smallest, have three layers, or tunics, that surround a central blood-containing space, the vessel lumen.
The innermost tunic is the tunica intima. The tunica intima contains the endothelium, the simple squamous epithelium that lines the lumen of all vessels.
The endothelium is continuous with the endocardial lining of the heart, and its flat cells fit closely together, forming a slippery surface that minimizes friction so blood moves smoothly through the lumen. In vessels larger than 1 mm in diameter, a subendothelial layer, consisting of a basement membrane and loose connective tissue, supports the endothelium.
The middle tunic, the tunica media, is mostly circularly arranged smooth muscle cells and sheets of elastin. The activity of the smooth muscle is regulated by sympathetic vasomotor nerve fibers of the autonomic nervous system and chemicals.
The activities of the tunica media are critical in regulating the circulatory system because small changes in vessel diameter greatly influence blood flow and blood pressure. Generally, the tunica media is the bulkiest layer in arteries, which bear the chief responsibility for maintaining blood pressure and proper circulation.
The outer layer of a blood vessel wall, the tunica externa, is mainly composed of collagen fibers that protect and reinforce the vessel, and anchor it to surrounding structures. The tunica externa contains nerve fibers, lymphatic vessels, and elastic fibers in large veins.
Interior layers of blood vessels receive nutrients directly from blood in the lumen. This has been a basic review of blood vessel structure and function.Respiratory System is a biological system consisting of specific organs and structures used for the process of respiration in an organism.
The respiratory system is involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment. Start studying Nervous, Skeletal, Circulatory, Respiratory, Digestive, Excretory, Endocrine Systems.
Learn vocabulary, terms, and more with flashcards, games, and. The cardiovascular and the respiratory system both work toward the same goal: getting oxygen to tissues and getting carbon dioxide out. The respiratory system is involved in supplying oxygen to the blood and removing carbon pfmlures.comd: Jun 17, HOME Free Essays How the digestive, cardiovascular and respiratory system are interrelate How the digestive, cardiovascular and respiratory system are interrelate Essay A.
The digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. Food passes through a long tube inside the body known as the alimentary canal or the gastrointestinal tract (GI tract).
Human digestive system: Human digestive system, the system used in the human body for the process of digestion. The human digestive system consists primarily of the digestive tract, or the series of structures and organs through which food and liquids pass during their processing into forms absorbable into the.