The Hering–Breuer inflation reflex, named for Josef Breuer and Ewald Hering, is a reflex triggered to prevent the over-inflation of the lung. Pulmonary stretch receptors present on the wall of bronchi and bronchioles of the airways respond to excessive stretching of the lung during large inspirations.
- 1 How does an inflation reflex control breathing?
- 2 Do the pulmonary stretch receptors stimulate inspiration?
- 3 Which receptors are stimulated by inflation of the lung?
- 4 How do stretch receptors control breathing?
- 5 What initiates the inflation reflex?
- 6 What does the inflation reflex do?
- 7 What does the inflation reflex do quizlet?
- 8 Why do the lungs expand along with the thoracic cage during inspiration?
- 9 Why does air flow into the lungs during inspiration?
- 10 What are stretch receptors?
- 11 What do stretch receptors signal?
- 12 Why do lungs stretch?
- 13 What is a stretch reflex?
- 14 Which receptors with the respiratory system respond to the inflation of the alveoli?
- 15 What role do stretch receptors play when blood pressure falls?
How does an inflation reflex control breathing?
The longest known lung reflex is the Hering-Breuer reflex (inflation reflex), which is stimulated by inflation of the lung during inspiration. The reflex response is to inhibit inspiration. This reflex is too weak to control the depth of the tidal volume during normal breathing.
Do the pulmonary stretch receptors stimulate inspiration?
Slowly adapting pulmonary stretch receptors have large myelinated fibers and are located in the smooth muscles of the airways. These receptors are activated when the lungs inflate and play a critical role in termination of inspiration and prolongation of expiration (Breuer–Hering reflex).
Which receptors are stimulated by inflation of the lung?
The pulmonary stretch receptors are located in the smooth muscle or lamina propria of the airways. The natural stimulus for these endings is inflation of lungs; the activity increases in phase with inspiration and may diminish or cease altogether during exspiration.
How do stretch receptors control breathing?
Pulmonary stretch receptors are mechanoreceptors found in the lungs. When the lung expands, the receptors initiate the Hering-Breuer reflex, which reduces the respiratory rate. Increased firing from the stretch receptors also increases production of pulmonary surfactant.
What initiates the inflation reflex?
The Hering-Breuer reflex is initiated by lung expansion, which excites stretch receptors in the airways.
What does the inflation reflex do?
The Hering–Breuer reflex (also called the inflation reflex) is triggered to prevent over-inflation of the lungs. There are many stretch receptors in the lungs, particularly within the pleura and the smooth muscles of the bronchi and bronchioles, that activate when the lungs have inflated to their ideal maximum point.
What does the inflation reflex do quizlet?
Hering-Breuer Reflex, Exercise and Cerebrum. An inflation reflex that regulates the depth of breathing involving stretch receptors and the vagus nerves.
Why do the lungs expand along with the thoracic cage during inspiration?
During inspiration, the diaphragm and external intercostal muscles contract, causing the rib cage to expand and move outward, and expanding the thoracic cavity and lung volume. This creates a lower pressure within the lung than that of the atmosphere, causing air to be drawn into the lungs.
Why does air flow into the lungs during inspiration?
Inspiration (inhalation) is the process of taking air into the lungs. It is the active phase of ventilation because it is the result of muscle contraction. During inspiration, the diaphragm contracts and the thoracic cavity increases in volume. This decreases the intraalveolar pressure so that air flows into the lungs.
What are stretch receptors?
A receptor that detects stretching in a muscle. Stretch receptors are essential for coordinated muscle activity, passing information about the state of muscles to the central nervous system (see kinaesthesis).
What do stretch receptors signal?
Muscle spindles are stretch receptors that signal the length and changes in length of muscles. They lie within an independent capsule, parallel to the main muscle. They are therefore stretched when the muscle lengthens but shorten when the muscle contracts.
Why do lungs stretch?
The respiratory muscles displace the equilibrium of elastic forces in the lung and chest in one direction or the other by adding muscular contraction. During inspiration, muscle contraction is added to the outward elastic force of the chest to increase the traction on the lung required for its additional stretch.
What is a stretch reflex?
The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching by increasing its contractility as long as the stretch is within physiological limits.
Which receptors with the respiratory system respond to the inflation of the alveoli?
Located in airways, rapidly adapting pulmonary stretch receptors (RARs) initiate protective reflexes in response to a variety of stimuli, including large or rapid lung inflation or deflation, inhaled irritants, and, possibly, airway edema (Canning & Spina, 2009).
What role do stretch receptors play when blood pressure falls?
Baroreceptors are specialized stretch receptors located within thin areas of blood vessels and heart chambers that respond to the degree of stretch caused by the presence of blood. They send impulses to the cardiovascular center to regulate blood pressure.