Answer:
The flattening of the action potentials of myocardial contractile cells, called the plateau phase, is due to a combination of <u>K+</u> efflux and <u>Ca2+</u><u> i</u>nflux occurring at the same time.
Explanation:
Plateau phase (maintained depolarization) is due to Ca2+ inflow due to opening of voltage-gated slow Ca2+ channels and K+ outflow with some K+ channels opening. It is maintained for 200-300 ms.
As the voltage of the cardiac muscle cell changes-it causes slower later opening L-Calcium channels and also the opening of some special slow delayed rectifier potassium channels (not the usual leak K channels or usual Voltage dependant K channels seen in neurons and skeletal muscle cells). The plateau phase is sustained by a balance between inward movement of Ca2+ through L-type Ca2 channels and outward movement of K+ thrugh slow delayed rectifier K+ channels.
The answer to the question "Upon realizing that your remote is not working even after replacing the batteries you decided to use, this process is called the experiment. You are experimenting on what would happen to the remote if you are going to change the batteries, if it is going to work or not.
<span>Facilitated diffusion
Diffusion
occurs because of the movement of molecules from the region of higher
concentration to the region of lower concentration. This movement of
molecules occurs due to a thermal motion. Diffusion normally occurs
between two compartments having difference in concentration. In case of
fluid it moves from the region of higher concentration to the region of
concentration until a balance is reached. The process of diffusion is
very important for the humans as well. The oxygen that humans breathe in
gets diffused with the blood.<span> </span></span>
Answer:
The concentration of a substance is the quantity of solute present in a given quantity of solution.
