C- and K+ channels are open
C- and K+ channels refer to ion channels that allow the flow of specific ions, namely Cl- (chloride) and K+ (potassium) ions, across the cell membrane. When these channels are open, it means that they are allowing the passage of their respective ions through the cell membrane.
To understand why C- and K+ channels are open, we have to look at the factors that can regulate channel activity. There are several mechanisms that can control the opening and closing of ion channels, such as changes in membrane voltage, intracellular signaling molecules, and physical stimuli.
For example, in the case of C- channels, they are often regulated by the balance of ion concentrations inside and outside the cell. If the concentration of Cl- ions is higher outside the cell, the C- channels will open to allow their entry into the cell, thus equalizing the concentrations.
On the other hand, K+ channels are typically regulated by changes in membrane potential. These channels tend to open when the cell is at rest, allowing K+ ions to leave the cell and maintaining the resting membrane potential. However, during certain cellular events or under specific conditions, these K+ channels can be closed or open.
It is important to note that the opening and closing of ion channels are dynamic processes actively regulated by various factors in the cell. The exact mechanisms and conditions under which C- and K+ channels open can vary depending on the specific cell type, physiological state, or environmental factors.