Image Caption : Heart and Lungs : The heart and lungs are the primary contents of the thorax. They are interconnected with very large blood vessels. The heart sends oxygen-poor blood through the pulmonary arteries to the lungs, which oxygenate it and return it to the heart through the pulmonary veins. The pulmonary arteries arise from one large pulmonary trunk, and then begin branching exponentially once they enter the lungs in order to reach the functional respiratory units and pick up oxygen. The smallest pulmonary veins then take the oxygenated blood backwards through the lungs and empty into the back of the heart through four larger pulmonary veins. The oxygen-rich blood is then pumped by the heart out into the body through the aorta. Deoxygenated blood from body tissues returns to the heart through the superior and inferior vena cava and the cardiac cycle repeats continuously. The pulmonary veins and arteries are the only case where arteries carry deoxygenated blood and veins carry blood that has been oxygenated.
The Respiratory System
The respiratory system is made up of organs and tissues that help you breathe. The main parts of this system are the airways, the lungs and linked blood vessels, and the muscles that enable breathing.
The Respiratory System
The airways are pipes that carry oxygen-rich air to your lungs. They also carry carbon dioxide, a waste gas, out of your lungs. The airways include your:
- Nose and linked air passages (called nasal cavities)
- Larynx (LAR-ingks), or voice box
- Trachea (TRA-ke-ah), or windpipe
- Tubes called bronchial tubes or bronchi, and their branches
Air first enters your body through your nose or mouth, which wets and warms the air. (Cold, dry air can irritate your lungs.) The air then travels through your voice box and down your windpipe. The windpipe splits into two bronchial tubes that enter your lungs.
A thin flap of tissue called the epiglottis (ep-ih-GLOT-is) covers your windpipe when you swallow. This prevents food and drink from entering the air passages that lead to your lungs.
Except for the mouth and some parts of the nose, all of the airways have special hairs called cilia (SIL-e-ah) that are coated with sticky mucus. The cilia trap germs and other foreign particles that enter your airways when you breathe in air.
These fine hairs then sweep the particles up to the nose or mouth. From there, they're swallowed, coughed, or sneezed out of the body. Nose hairs and mouth saliva also trap particles and germs.
Lungs and Blood Vessels
Your lungs and linked blood vessels deliver oxygen to your body and remove carbon dioxide from your body. Your lungs lie on either side of your breastbone and fill the inside of your chest cavity. Your left lung is slightly smaller than your right lung to allow room for your heart.
Within the lungs, your bronchi branch into thousands of smaller, thinner tubes called bronchioles. These tubes end in bunches of tiny round air sacs called alveoli (al-VEE-uhl-eye).
Each of these air sacs is covered in a mesh of tiny blood vessels called capillaries. The capillaries connect to a network of arteries and veins that move blood through your body.
The pulmonary (PULL-mun-ary) artery and its branches deliver blood rich in carbon dioxide (and lacking in oxygen) to the capillaries that surround the air sacs. Inside the air sacs, carbon dioxide moves from the blood into the air. At the same time, oxygen moves from the air into the blood in the capillaries.
The oxygen-rich blood then travels to the heart through the pulmonary vein and its branches. The heart pumps the oxygen-rich blood out to the body. (For more information about blood flow, go to the Health Topics How the Heart Works article.)
The lungs are divided into five main sections called lobes. Some people need to have a diseased lung lobe removed. However, they can still breathe well using the rest of their lung lobes.
Muscles Used for Breathing
Muscles near the lungs help expand and contract (tighten) the lungs to allow breathing. These muscles include the:
- Diaphragm (DI-ah-fram)
- Intercostal muscles
- Abdominal muscles
- Muscles in the neck and collarbone area
The diaphragm is a dome-shaped muscle located below your lungs. It separates the chest cavity from the abdominal cavity. The diaphragm is the main muscle used for breathing.
The intercostal muscles are located between your ribs. They also play a major role in helping you breathe.
Beneath your diaphragm are abdominal muscles. They help you breathe out when you're breathing fast (for example, during physical activity).
Muscles in your neck and collarbone area help you breathe in when other muscles involved in breathing don't work well, or when lung disease impairs your breathing.
NHLBI / NIH
Major Respiratory Structures and Respiratory System
The major organs of the respiratory system function primarily to provide oxygen to body tissues for cellular respiration, remove the waste product carbon dioxide, and help to maintain acid-base balance. Portions of the respiratory system are also used for non-vital functions, such as sensing odors, speech production, and for straining, such as during childbirth or coughing (Figure).
Functionally, the respiratory system can be divided into a conducting zone and a respiratory zone. Theconducting zoneof the respiratory system includes the organs and structures not directly involved in gas exchange. The gas exchange occurs in therespiratory zone.ala(plural = alae) small, flaring structure of a nostril that forms the lateral side of the nares
cartilage that supports the apex of the nose and helps shape the nares; it is connected to the septal cartilage and connective tissue of the alae
small tube that leads from the terminal bronchiole to the respiratory bronchiole and is the point of attachment for alveoli
immune system cell of the alveolus that removes debris and pathogens
opening that allows airflow between neighboring alveoli
cluster of alveoli
small, grape-like sac that performs gas exchange in the lungs
tip of the external nose
collective name for the multiple branches of the bronchi and bronchioles of the respiratory system
portion of the external nose that lies in the area of the nasal bones
branch of bronchi that are 1 mm or less in diameter and terminate at alveolar sacs
tube connected to the trachea that branches into many subsidiaries and provides a passageway for air to enter and leave the lungs
region of the respiratory system that includes the organs and structures that provide passageways for air and are not directly involved in gas exchange
portion of the larynx composed of a ring of cartilage with a wide posterior region and a thinner anterior region; attached to the esophagus
intermediate portion of the external nose that connects the bridge to the apex and is supported by the nasal bone
leaf-shaped piece of elastic cartilage that is a portion of the larynx that swings to close the trachea during swallowing
region of the nose that is easily visible to others
portion of the posterior oral cavity that connects the oral cavity to the oropharynx
specialized membrane that connects the ends of the C-shape cartilage in the trachea; contains smooth muscle fibers
opening between the vocal folds through which air passes when producing speech
region where the two lamina of the thyroid cartilage join, forming a protrusion known as "Adam's apple"
portion of the pharynx bordered by the oropharynx superiorly and esophagus and trachea inferiorly; serves as a route for both air and food
cartilaginous structure that produces the voice, prevents food and beverages from entering the trachea, and regulates the volume of air that enters and leaves the lungs
lymphoid tissue located at the base of the tongue
one of three recesses (superior, middle, and inferior) in the nasal cavity attached to the conchae that increase the surface area of the nasal cavity
(plural = nares) opening of the nostrils
bone of the skull that lies under the root and bridge of the nose and is connected to the frontal and maxillary bones
wall composed of bone and cartilage that separates the left and right nasal cavities
portion of the pharynx flanked by the conchae and oropharynx that serves as an airway
portion of the pharynx flanked by the nasopharynx, oral cavity, and laryngopharynx that is a passageway for both air and food
one of the paired structures composed of lymphoid tissue located anterior to the uvula at the roof of isthmus of the fauces
one of the cavities within the skull that is connected to the conchae that serve to warm and humidify incoming air, produce mucus, and lighten the weight of the skull; consists of frontal, maxillary, sphenoidal, and ethmoidal sinuses
structure composed of lymphoid tissue located in the nasopharynx
region of the conducting zone that forms a tube of skeletal muscle lined with respiratory epithelium; located between the nasal conchae and the esophagus and trachea
concave surface of the face that connects the apex of the nose to the top lip
substance composed of phospholipids and proteins that reduces the surface tension of the alveoli; made by type II alveolar cells
specific type of bronchiole that leads to alveolar sacs
ciliated lining of much of the conducting zone that is specialized to remove debris and pathogens, and produce mucus
alveolar and capillary wall together, which form an air-blood barrier that facilitates the simple diffusion of gases
includes structures of the respiratory system that are directly involved in gas exchange
region of the external nose between the eyebrows
largest piece of cartilage that makes up the larynx and consists of two lamina
tube composed of cartilaginous rings and supporting tissue that connects the lung bronchi and the larynx; provides a route for air to enter and exit the lung
smooth muscle located in the fibroelastic membrane of the trachea
true vocal cord
one of the pair of folded, white membranes that have a free inner edge that oscillates as air passes through to produce sound
type I alveolar cell
squamous epithelial cells that are the major cell type in the alveolar wall; highly permeable to gases
type II alveolar cell
cuboidal epithelial cells that are the minor cell type in the alveolar wall; secrete pulmonary surfactant
part of the folded region of the glottis composed of mucous membrane; supports the epiglottis during swallowing
Download for free at http://cnx.org/contents/b76b2090-243e-429a-8144-2e45bda6ab75@9
The respiratory system (called also respiratory apparatus, ventilatory 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.
In air-breathing vertebrates like human beings, respiration takes place in the respiratory organs called lungs. The passage of air into the lungs to supply the body with oxygen is known as inhalation, and the passage of air out of the lungs to expel carbon dioxide is known as exhalation; this process is collectively called breathing or ventilation. In humans and other mammals, the anatomical features of the respiratory system include trachea, bronchi, bronchioles, lungs, and diaphragm. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood. This exchange process occurs in the alveoli (air sacs) in the lungs.
In fish and many invertebrates, respiration takes place through the gills. Other animals, such as insects, have respiratory systems with very simple anatomical features, and in amphibians even the skin plays a vital role in gas exchange. Plants also have respiratory systems but the directionality of gas exchange can be opposite to that in animals. The respiratory system in plants also includes anatomical features such as holes on the undersides of leaves known as stomata.
The material on this site is for informational purposes only and is not intended as medical advice. It should not be used to diagnose or treat any medical condition. Consult a licensed medical professional for the diagnosis and treatment of all medical conditions and before starting a new diet or exercise program. If you have a medical emergency, call 911 immediately.