Respiratory Pump
Respiratory Pump - Related Videos
01:30
ATP Driven Pumps III: V-type Pumps
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2023
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient. The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
01:34
ATP Driven Pumps II: P-type Pumps
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2023
The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V. A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
13:10
Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
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Cited by 130 •
2013
The present protocol provides a detailed step-by-step description of the procedures required to execute measurements of respiratory system mechanics as well as the assessment of airway responsiveness to inhaled methacholine in mice using the forced oscillation technique (flexiVent; SCIREQ Inc, Montreal, Qc, Canada).
09:59
Respiratory Exam I: Inspection and Palpation
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2023
Source: Suneel Dhand, MD, Attending Physician, Internal Medicine, Beth Israel Deaconess Medical Center Disorders of the respiratory system with a chief complaint of shortness of breath are among the most common reasons for both outpatient and inpatient evaluation. The most obvious visible clue to a respiratory problem will be whether the patient is displaying any signs of respiratory distress, such as fast respiratory rate and/or cyanosis. In a clinical situation, this will always require...
01:13
Pumped Concrete
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2024
Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery. For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
FAQs
Airflow depends on a pressure gradient rather than on muscles pushing air directly. When the diaphragm and external intercostal muscles contract, the thoracic cavity expands and intrapulmonary pressure falls. Air then moves inward from the surrounding environment. This relationship between muscular contraction, cavity volume, and pressure explains how coordinated skeletal movement produces inspiration.
During quiet expiration, relaxation of the inspiratory muscles allows elastic recoil to reduce thoracic volume and promote outward airflow. When breathing must become more forceful, abdominal and internal intercostal muscles can strengthen expiration. Their contribution shows that expiration is not always a passive phase and that breathing effort can be adjusted through additional muscular activity.
Thoracic pressure changes do more than move air. They also influence venous return, the movement of blood back toward the heart, and can therefore affect cardiac function. This connection makes the respiratory pump relevant to both ventilation and circulation, allowing biology students to examine breathing as part of an integrated cardiopulmonary system.
The respiratory pump provides a framework for examining how coordinated muscle activity and pressure changes support altered breathing demands during exercise. Studying the diaphragm, intercostal muscles, thoracic expansion, and expiratory assistance helps relate mechanical events to ventilation. This approach connects observable breathing responses with the underlying muscular and skeletal processes.
Studying the respiratory pump establishes a normal reference for interpreting respiratory disorders. Researchers can consider whether problems involve coordinated muscle action, thoracic expansion, pressure changes, elastic recoil, or the ability to strengthen forced breathing. Comparing these features with normal inspiration and expiration helps organize how a disorder may affect ventilation and oxygen supply.
Mechanical ventilation is easier to understand when compared with the body’s normal respiratory pump. The normal system shows how diaphragm and intercostal activity changes thoracic volume and intrapulmonary pressure to move air. Examining the effects of mechanical ventilation against this biological framework helps clarify how externally supported breathing relates to natural ventilation and circulation.