KatavMD Atlas · Public Beta

Visual guides

Study medicine through its connections. Each guide introduces a map and takes you into the Atlas to explore it.

The ECG connects to QRS, QT and T wave. QRS represents a component of ventricular depolarization; T, of repolarization. QT provides information about both processes.The ECG connects to QRS, QT and T wave. QRS represents a component of ventricular depolarization; T, of repolarization. QT provides information about both processes.

Electrophysiology · Cardiovascular

ECG: from the QRS complex and T wave to the QT interval

Connect the QRS complex, T wave and QT interval with ventricular depolarization and repolarization in a map from the KatavMD Atlas.

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Beta2 agonists includes albuterol, formoterol and salmeterol. Each drug participates in beta2 agonism, whose target is the beta-2 adrenergic receptor.Beta2 agonists includes albuterol, formoterol and salmeterol. Each drug participates in beta2 agonism, whose target is the beta-2 adrenergic receptor.

Pharmacology · Receptors

Salbutamol (albuterol): mechanism of action and the β₂ receptor

Explore how salbutamol (albuterol) connects to beta-2 agonism and its receptor, and the mechanism it shares with formoterol and salmeterol in the KatavMD Atlas.

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Epinephrine and norepinephrine connected to beta-1 and beta-2 receptors, with cellular contexts and histological paths to heart, renal cortex and lung.Epinephrine and norepinephrine connected to beta-1 and beta-2 receptors, with cellular contexts and histological paths to heart, renal cortex and lung.

Receptors · Histology · Anatomy

β1 and β2 receptors: from mediator to cell and organ

Compare beta-1 and beta-2 receptors through epinephrine, norepinephrine, target cells, and documented cardiac, renal and bronchiolar applications.

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Determinants of stroke volume and cardiac output, with preload, afterload, contractility, heart rate, regurgitation, pressure and perfusion connections.Determinants of stroke volume and cardiac output, with preload, afterload, contractility, heart rate, regurgitation, pressure and perfusion connections.

Physiology · Cardiovascular

Cardiac output: why heart rate is only part of the story

Explore cardiac output, stroke volume, preload, afterload and contractility, with a separate view of autonomic and receptor regulation.

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Map of hepatic fibrosis, intrahepatic resistance, portal and sinusoidal pressures, microvascular water outflow, ascites, extracellular volume, and esophageal and splanchnic vascular branches.Map of hepatic fibrosis, intrahepatic resistance, portal and sinusoidal pressures, microvascular water outflow, ascites, extracellular volume, and esophageal and splanchnic vascular branches.

Pathophysiology · Liver and circulation

Cirrhosis: contributors, mechanisms and consequences

Explore clinical relationships around cirrhosis and a map of hepatic fibrosis, vascular resistance, portal pressure and ascites, with conditions and sources.

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Reduced ventricular compliance and reduced mitral valve competence begin two branches converging on elevated mean left atrial pressure. A branch continues to pulmonary venous and capillary pressures; regurgitant flow also connects to reduced cardiac output.Reduced ventricular compliance and reduced mitral valve competence begin two branches converging on elevated mean left atrial pressure. A branch continues to pulmonary venous and capillary pressures; regurgitant flow also connects to reduced cardiac output.

Pathophysiology · Cardiovascular and pulmonary circulation

Pulmonary congestion: converging pressures and diverging flows

Compare two pathways converging on left atrial pressure and follow their connections to pulmonary pressures and cardiac output in an interactive map.

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Diagram connecting C5 to the shoulder and anterior arm; C6 to the anterior forearm and both hand surfaces; C7 to the posterior forearm and both hand surfaces. Every connection is a partial intersection.Diagram connecting C5 to the shoulder and anterior arm; C6 to the anterior forearm and both hand surfaces; C7 to the posterior forearm and both hand surfaces. Every connection is a partial intersection.

Anatomy · Nervous system

C5, C6 and C7 dermatomes: territories and shared regions

Compare C5, C6 and C7 dermatomes in an interactive map connecting the shoulder, arm, forearm and hand. Learn how to read their regional intersections.

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Acetylcholine and M3 receptor, and histamine and H2 receptor, converge on gastric acid secretion and the parietal cell, linked to ion pump, gastric body and luminal acidity.Acetylcholine and M3 receptor, and histamine and H2 receptor, converge on gastric acid secretion and the parietal cell, linked to ion pump, gastric body and luminal acidity.

Physiology · Digestive system

Gastric acid secretion: converging signals in the parietal cell

Follow acetylcholine/M3 and histamine/H2 convergence on acid secretion, its effector cell and gastric context, with relationship conditions and sources.

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Breast and skin of the anterior thoracic and upper abdominal walls drain toward pectoral axillary nodes. Pectoral and humeral groups converge on central nodes, continue toward apical nodes and branch to deep cervical nodes and the subclavian trunk.Breast and skin of the anterior thoracic and upper abdominal walls drain toward pectoral axillary nodes. Pectoral and humeral groups converge on central nodes, continue toward apical nodes and branch to deep cervical nodes and the subclavian trunk.

Anatomy · Lymphatic networks

Lymphatic drainage: different territories, shared pathways

Explore how breast and skin territories connect with axillary groups, where pathways converge, and how cervical and venous outlets extend the network.

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Shared functional sequence of patellar and Achilles reflexes: proprioception, spinal integration, acetylcholine, end-plate potential, muscle action potential, calcium and tension.Shared functional sequence of patellar and Achilles reflexes: proprioception, spinal integration, acetylcholine, end-plate potential, muscle action potential, calcium and tension.

Physiology · Nervous and musculoskeletal systems

Patellar and Achilles reflexes: a shared sequence, different circuits

Compare patellar and Achilles reflexes from muscle spindle input to tension, with nerves, spinal segments and muscle activation stages.

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Increased fecal water excretion, external gastric outflow, and four renal states converge on reduced extracellular fluid volume. Outgoing connections reach reduced systemic arterial pressure, hepatic perfusion, and intestinal perfusion.Increased fecal water excretion, external gastric outflow, and four renal states converge on reduced extracellular fluid volume. Outgoing connections reach reduced systemic arterial pressure, hepatic perfusion, and intestinal perfusion.

Pathophysiology · Digestive, renal, and perfusion

Volume loss: digestive and renal convergence, divergence toward organ perfusion

Connect digestive losses, renal sodium and water handling, extracellular volume, and organ perfusion. Distinguish balance, pressure, and regional blood flow.

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Map of collecting duct permeability and water reabsorption with vasopressin, V2 receptor, osmotic gradient, cellular mechanisms, principal cell and urinary and circulatory variables.Map of collecting duct permeability and water reabsorption with vasopressin, V2 receptor, osmotic gradient, cellular mechanisms, principal cell and urinary and circulatory variables.

Physiology · Urinary system

Renal water regulation: permeability, gradient and reabsorption

Explore how vasopressin, the V2 receptor, permeability and the osmotic gradient converge on water reabsorption, with cellular mechanisms and evidence limits.

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