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Tag Archives: Recruitment

Diffusion of Gases


Diffusion of a gas occurs when there is a net movement of molecules from an area in which that particular gas exerts a high partial pressure to an area in which it exerts a lower partial pressure. Movement of a gas by diffusion is therefore different from the movement of gases through the conducting airways, […]

[Respiration][Circulation] Blood Flow to the Lung – General and Pulmonary Vascular Resistance


The lung receives blood flow via both the bronchial circulation and the pulmonary circulation. Bronchial blood flow constitutes a very small portion of the output of the left ventricle and supplies part of the tracheobronchial tree with systemic arterial blood. Pulmonary blood flow (PBF) constitutes the entire output of the right venticle and supplies the […]

Hemostasis Mechanism – Platelet Structure and Function


Platelet Granules and Organelles Platelets possess secretory granules and mechanisms for cargo release to amplify responses to stimuli and influence the surrounding environment. Platelet granule structures include 𝛼- and dense granules, lysosomes, and peroxisomes. 𝛼-Granules and the dense bodies are the main secretory granules that release cargo (e.g., fibrinogen and adenosine diphosphate [ADP]) upon platelet […]

Inflammation – The Beginning and Ongoing


Inflammation is a response of vascularized tissues to infections, foreign invaders, and damaged tissues that brings cells and molecules of host defines from the circulation to the sites where they are needed, in order to eliminate the offending agents. Inflammation generally is a defensive response that is essential for survival, where mediators of this response […]