Questions and Answers
What is the interface called between the body and electronic measuring devices?
Electrode-Electrolyte Interface
Which of the following is true about the flow of current at the Electrode-Electrolyte Interface?
Current is carried in the body by electrons.
False
To sense a signal, a current must flow at the ______.
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Which reactions occur at the Electrode-Electrolyte Interface?
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What type of electrodes change ionic current into electronic current?
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Study Notes
Bio-potential Electrodes Overview
- Bio-potential electrodes facilitate interaction between the body and electronic measuring devices; they conduct current across this interface.
- Current in biological tissues is carried by ions, while electronic devices operate with electrons.
- Essential function of electrodes is to convert ionic current (in the body) to electronic current (in devices) at the Electrode-Electrolyte Interface.
Current Flow and Electrode-Electrolyte Interface
- Electrons and ions flow in opposite directions at the interface, crucial for signal detection.
- Cations (C+) move in the same direction as the current flow, whereas anions (A–) move opposite to current flow.
- Chemical reactions occur during current flow:
- Oxidation reaction: C ⇌ C+ + e–
- Reduction reaction: A– ⇌ A + e–
- No current occurs at equilibrium states, highlighting the importance of active current for electrode function.
Key Components of Bio-potential Electrodes
- The structure of electrodes includes a metal component in contact with an electrolyte.
- The interaction between the metal (M) and electrolyte (M+) is vital for effective current sensing.
- To effectively sense a signal (I), a current must be allowed to flow across the electrode-electrolyte interface.
Electrode Types
- Body-surface recording electrodes monitor external biopotentials.
- Internal electrodes are used for deeper signal acquisition within the body.
- Electrode arrays allow for multi-point measurements, enhancing signal detection and analysis.
Practical Considerations
- Understanding polarization effects is essential; electrodes can be polarized (changing impedance under current flow) or nonpolarized (stable impedance).
- Motion artifacts can affect signal integrity, emphasizing the need for proper placement and stabilization of electrodes during measurement.
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Description
This quiz explores the fundamental concepts of bio-potential electrodes, focusing on their function in converting ionic current to electronic current. You'll learn about the flow of electrons and ions, the electrode-electrolyte interface, and the chemical reactions involved in current flow. Test your knowledge on the essential components and mechanisms of these critical devices.
