enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Myocardial contractility - Wikipedia

   en.wikipedia.org/wiki/Myocardial_contractility

   When it's phosphorylated by PKA, levels of calcium stored in the sarcoplasmic reticulum are increased, allowing a higher rate of calcium being released at the next contraction. However, the increased rate of calcium sequestration also leads to an increase in lusitropy. Sensitizing troponin-C to the effects of calcium.

3. Cardiac action potential - Wikipedia

   en.wikipedia.org/wiki/Cardiac_action_potential

   These calcium ions bind to and open more calcium channels (called ryanodine receptors) located on the sarcoplasmic reticulum within the cell, allowing the flow of calcium out of the SR. These calcium ions are responsible for the contraction of the heart. Calcium also activates chloride channels called I to2, which allow Cl − to enter the cell ...

4. Bowditch effect - Wikipedia

   en.wikipedia.org/wiki/Bowditch_effect

   The sodium-calcium exchanger (which allows 3 Na + to flow down its electrochemical gradient in exchange for 1 Ca ++ ion to flow out of the cell) works to decrease the levels of intracellular calcium. As the heart rate becomes more robust, and the length of diastole decreases, the Na + /K +-ATPase, which removes the Na + brought into the cell by ...

5. Cardiac muscle - Wikipedia

   en.wikipedia.org/wiki/Cardiac_muscle

   This difference can be illustrated by the observation that cardiac muscle fibers require calcium to be present in the solution surrounding the cell to contract, while skeletal muscle fibers will contract without extracellular calcium. During contraction of a cardiac muscle cell, the long protein myofilaments oriented along the length of the ...

6. Cardiac pacemaker - Wikipedia

   en.wikipedia.org/wiki/Cardiac_pacemaker

   It is important to note that intracellular calcium causes muscular contraction in contractile cells, and is the effector ion. In heart pacemaker cells, phase 0 depends on the activation of L-type calcium channels instead of the activation of voltage-gated fast sodium channels, which are responsible for initiating action potentials in ...

7. Cardiac excitation-contraction coupling - Wikipedia

   en.wikipedia.org/wiki/Cardiac_excitation...

   Cardiac excitation-contraction coupling (Cardiac EC coupling) describes the series of events, from the production of an electrical impulse (action potential) to the contraction of muscles in the heart. [1] This process is of vital importance as it allows for the heart to beat in a

8. 8 Common Cardiovascular Diseases for Men & How to Prevent Them

   www.aol.com/8-common-cardiovascular-diseases-men...

   An irregular and often very fast heart rate. Premature ventricular contraction (PVC). When the bottom chambers of your heart beat too early. ... Calcium-channel blockers. Disopyramide.

9. Diad - Wikipedia

   en.wikipedia.org/wiki/Diad

   The rapid influx of calcium into the cell signals for the cells to contract. When the calcium intake travels through an entire muscle, it will trigger a united muscular contraction. This process is known as excitation-contraction coupling. [2] This contraction pushes blood inside the heart and from the heart to other regions of the body.