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Related Concept Videos

Anatomy of the Heart01:27

Anatomy of the Heart

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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Clearance Models: Physiological Models01:09

Clearance Models: Physiological Models

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Drug clearance is a critical pharmacokinetic process involving the irreversible removal of drugs from the body through various organs over a specified time period. Physiological models are indispensable in determining organ-specific clearance, defined by the proportion of the drug eliminated per unit of time from the organ's blood volume.
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Location and Orientation of the Heart01:13

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The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.
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Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

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Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
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Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
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Related Experiment Videos

Eye2Heart : a validated lumped-parameter model bridging cardiovascular and ocular dynamics.

Lorenzo Sala, Mohamed Zaid, Faith Hughes

    Arxiv
    |April 29, 2025
    PubMed
    Summary
    This summary is machine-generated.

    The new Eye2Heart model links heart and eye blood flow using math. This helps understand how cardiovascular diseases affect vision and vice versa.

    Related Experiment Videos

    Area of Science:

    • Cardiovascular Physiology
    • Ocular Hemodynamics
    • Mathematical Modeling

    Background:

    • The cardiovascular and ocular systems share intricate hemodynamic connections.
    • Current models often analyze these systems in isolation, hindering understanding of their interdependence.
    • Understanding these interactions is vital for both physiological regulation and pathological conditions.

    Purpose of the Study:

    • To introduce the Eye2Heart model, a novel closed-loop mathematical framework.
    • To integrate cardiovascular and ocular dynamics for a holistic view.
    • To explore the impact of ocular parameters on systemic circulation and vice versa.

    Main Methods:

    • Developed a mathematical model using an electrical-hydraulic analogy.
    • Described heart-retinal circulation interactions via ordinary differential equations.
    • Validated the model against clinical and experimental data.

    Main Results:

    • The Eye2Heart model accurately reproduced key cardiovascular parameters (e.g., stroke volume, cardiac output).
    • The model successfully simulated ocular hemodynamics, including retinal blood flow.
    • In silico experiments revealed critical dependencies between intraocular pressure, left ventricular compliance, and circulation.

    Conclusions:

    • The Eye2Heart model provides a unified framework for studying cardiovascular and ocular systems.
    • It offers potential for investigating cardiovascular diseases with ocular manifestations.
    • The model supports patient-specific data integration for personalized medicine applications.