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Related Concept Videos

G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
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Ionic Basis of Cardiac Action Potentials
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Antihypertensive Drugs: Action of Calcium Channel Blockers

Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Relaxation of Skeletal Muscles

The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
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Related Experiment Video

Updated: May 15, 2026

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
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Published on: January 10, 2011

Stretch-activated BK channel and heart function.

Ken Takahashi1, Keiji Naruse

  • 1Department of Cardiovascular Physiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan. takah-k2@cc.okayama-u.ac.jp

Progress in Biophysics and Molecular Biology
|January 3, 2013
PubMed
Summary
This summary is machine-generated.

The heart

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Biophysics

Background:

  • The heart experiences constant mechanical stress from contraction and dilation.
  • Mechanosensitivity, the ability to respond to mechanical stimuli, is vital for heart function.
  • Stretch-activated ion channels are key molecules involved in cellular mechanosensitivity.

Purpose of the Study:

  • To investigate the role of stretch-activated KCa (SAKCA) channels in cardiac mechanosensitivity.
  • To explore the involvement of SAKCA channels in action potential generation and heart rate modulation.

Main Methods:

  • Identification and characterization of stretch-activated ion channels in cardiac cells.
  • Electrophysiological studies to assess channel activity in response to mechanical stretch.
  • Analysis of BK channel expression and function in cardiomyocytes.

Main Results:

  • The stretch-activated KCa (SAKCA) channel, a type of Big Potassium (BK) channel, exhibits mechanosensitive responses to membrane stretch.
  • SAKCA channels are present in the chick heart and are sensitive to stretch.
  • BK channels, including SAKCA, are voltage- and calcium-dependent, suggesting a role in action potential generation.

Conclusions:

  • SAKCA channels are likely involved in the heart's response to mechanical stimuli.
  • Further research is needed to fully elucidate the role of mechanosensitive BK channels in regulating heart rate and contractility.