Haemodynamic response
Haemodynamic Response
The Haemodynamic Response (pronounced: hee-mo-dynamic response) is a physiological phenomenon observed in the cardiovascular system. It refers to the changes in blood flow (or blood velocity) in response to neural activity.
Etymology
The term "Haemodynamic" is derived from the Greek words "haima" meaning blood and "dynamikos" meaning powerful. The term "response" is from the Latin "respondere" meaning to answer.
Definition
The Haemodynamic Response is the change in blood flow to different parts of the body in response to varying levels of activity, stress, or disease. It is a critical aspect of how the body regulates its blood flow to meet the metabolic needs of different tissues.
Related Terms
- Blood Flow: The continuous circulation of blood in the cardiovascular system.
- Neural Activity: The combined electrical activity of the neurons in the brain and nervous system.
- Cardiovascular System: The organ system that circulates blood throughout the body, consisting of the heart, blood vessels, and blood.
- Metabolic Needs: The energy and material requirements of the body's cells and tissues.
Haemodynamic Response Function
The Haemodynamic Response Function (HRF) is a mathematical model used to describe the Haemodynamic Response in the brain to a brief local increase in neural activity. It is used in functional magnetic resonance imaging (fMRI) to model the link between neural activity and the observed blood oxygen level dependent (BOLD) signal.
Related Terms
- Functional Magnetic Resonance Imaging (fMRI): A neuroimaging technique that measures brain activity by detecting changes associated with blood flow.
- Blood Oxygen Level Dependent (BOLD) signal: A method used in functional magnetic resonance imaging (fMRI) to observe different areas of the brain or other organs, which correspond to the delivered oxygen.
External links
- Medical encyclopedia article on Haemodynamic response
- Wikipedia's article - Haemodynamic response
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