The heart and lungs collaborate to ensure that the body receives the oxygen-rich blood it requires to operate correctly. The Pulmonary Circuit The right side of the heart takes oxygen-depleted blood from the body and transports it to the lungs for cleansing and re-oxygenation. The lungs are made up of a network of passageways called bronchioles that lead to tiny air sacs called alveoli. The respiratory system is composed of two main parts: the airway system, which includes the trachea (windpipe), the bronchi (large breathing tubes), the lobes, and the sublobules of the lung; and the gas-exchange system, which includes the alveoli. The respiratory system is protected by a tough membrane called the pleura. The lungs will fill with air if the patient breathes in deeply or takes a breath while lying down. When this happens, the reduced pressure within the chest cavity causes the lungs to expand. This expansion forces any excess fluid into the central veins through small valves called ligaments. The thin walls of the veins are not strong enough to resist the force of the expanding lung so any fluid inside them will be forced into the adjacent lymph nodes where it is absorbed by capillaries into the vein wall.
As air flows into the lungs through the nose or mouth, it picks up moisture from the surrounding tissues. This moist air then passes into the branching tubes called bronchi.
Breathing can be affected by your heart. The Pulmonary Loop No. 1 The right side of the heart collects oxygen-depleted blood from the body and transports it to the lungs... 2. The Loop in the System Once the blood has been re-oxygenated, the left side of the heart circulates it throughout the body, thus... 3. The Pulmonary Loop #3
The right side of the heart sends oxygen-rich blood to the lungs where it gets cleaned up of carbon dioxide before being returned back to the heart to be pumped again. The respiratory system is a closed loop: air enters the nose and passes into the throat where it is divided into two branches: the upper airway and the lower airway. The upper airway leads to the nasal cavity while the lower airway continues down through the trachea into the bronchi where gas exchange takes place. The respiratory cycle consists of inhalation and exhalation. During inhalation, air enters the lungs and large muscles in the chest wall expand to force more air into the lungs. This increases the pressure inside the chest cavity and pushes the diaphragm upward, causing the stomach to fill with air. As the lungs fill with air, the rib cage expands outwardly causing the arms to lift off the bed. This action is called abduction. Abduction is necessary for effective breathing because it opens up the thoracic cavity and allows room for the expanded lungs to move around. Without abduction, the lungs would remain compressed... 4.
The pulmonary circulation is a brief loop that connects the heart to the lungs and back. Systemic circulation transports blood from the heart to the rest of the body and back again. The systemic circuit includes the aorta, two large arteries that carry blood from the heart out into the body, and then back into the heart via the coronary arteries, which are also large vessels. The aorta rises up from the bottom of the heart, where it branches into two one on each side of the chest. From there, the arteries spread out over the top of the lung like a net with many small holes in it, called bronchioles, which lead down to the alveoli (the tiny air sacs within the lung). Here, oxygen-rich blood flows back up to the left atrium of the heart through the pulmonary veins. The right side of the heart has its own set of vessels: the inferior vena cava and the superior vena cava. These vessels connect with the heart through openings called valves, which prevent the flow of blood flowing in one direction from interfering with the flow of blood going in the other direction.
The pulmonary circulation is very different from the systemic circulation in many ways. First of all, there are no large arteries feeding into large veins as in the systemic circuit.
The blood takes up oxygen and excretes carbon dioxide in the lungs. The blood subsequently flows back to the heart through the pulmonary veins. At the end of this journey, called the systemic circulation, the blood enters small arteries called arterioles that feed into tiny air-filled sacs called alveoli. From there, the blood is pumped back into the large vessels called venules that carry it to the heart. When you breathe in, the alveoli expand, allowing more oxygen to enter your bloodstream. This makes every cell of your body more aware of its need for oxygen. Cells use this signal to start producing more enzymes that break down toxic substances and chemicals found in food. These products include free radicals, which are molecules with an odd number of electrons. Free radicals can be good because they help fight infection and destroy harmful cells but also cause damage to healthy tissue as well.
When you breathe out, the alveoli contract, removing waste from the blood. Carbon dioxide is released into the blood as a result of this process. The heart then pumps the blood into the large vessels called arteries that lead away from the alveoli toward all parts of the body.
Respiration is important for life because it gives us energy to live day to day activities.