Zoology

What is Electrocardiogram (ECG)? Purpose of ECG Test The electrocardiogram (ECG) test is a fundamental diagnostic tool utilized in cardiology to assess the heart’s electrical activity and rhythm. Its purposes are multifaceted, enabling healthcare providers to detect, diagnose, and monitor various cardiac conditions effectively. Working principle of electrocardiograph/Electrocardiogram Waves of Normal ECG A normal electrocardiogram … Read more

The regulation of heart rate is a critical component of cardiovascular physiology, influencing overall heart function and health. Heart rate (HR) is defined as the number of times the heart beats within a minute. Together with stroke volume (SV), which is the volume of blood ejected from each ventricle during a single contraction, heart rate … Read more

What is Frank-Starling Law? Mechanism of the Frank-Starling mechanism The mechanism underlying left ventricular performance is intricately linked to the Frank-Starling Law, which establishes the relationship between preload and cardiac output. This relationship can be observed through the Frank-Starling curves, which depict how variations in left ventricular end-diastolic volume (EDV) or pressure influence stroke volume … Read more

What is Heart Conduction System? Components of Heart Conduction System The heart conduction system is a specialized network that plays a critical role in maintaining the heart’s rhythm and ensuring effective blood circulation throughout the body. This system consists of various components, each with unique functions that contribute to the synchronized contraction of the heart … Read more

What is Cardiac Cycle? Cardiac Cycle Phases The cardiac cycle refers to the sequence of events that occurs from the beginning of one heartbeat to the beginning of the next. This cycle consists of two primary phases: ventricular contraction, known as systole, and ventricular relaxation, referred to as diastole. Each of these phases can be … Read more

What is Myocardium? Definition of Myocardium The myocardium is the thick, muscular middle layer of the heart wall, located between the epicardium and endocardium. It is primarily composed of cardiac muscle cells (cardiomyocytes) that enable the heart to contract and pump blood throughout the body. Layers in the Walls of the Heart The heart, a … Read more

Overview of Heart Conduction The conduction system of the heart is a complex network that orchestrates the electrical signals required for heart muscle contraction. This system ensures that the heart beats in a coordinated manner, facilitating efficient blood circulation throughout the body. The process begins with the generation of an electrical signal, which propagates through … Read more

What is Coronary circulation? Anatomy Of the coronary circulation The anatomy of the coronary circulation is crucial for understanding how the heart receives its blood supply. This system consists of the coronary arteries and veins, which work together to deliver oxygen-rich blood to the myocardium and return deoxygenated blood back to the heart. Coronary Arteries … Read more

What is Cardiac Output? What is Cardiac Index? Cardiac Index (CI) is a crucial measure in cardiovascular physiology that expresses cardiac output in relation to the individual’s body surface area (BSA). This index provides a more accurate understanding of heart function by accounting for the size of the person, making it a more individualized and … Read more

What is Carbon Monoxide Poisoning? Pathophysiology of Carbon Monoxide Poisoning The pathophysiology of carbon monoxide (CO) poisoning involves complex interactions within the body that result in severe physiological disturbances. The following points summarize the key aspects of how carbon monoxide affects human health: Toxicokinetics of Carbon Monoxide Poisoning The toxicokinetics of carbon monoxide (CO) poisoning … Read more