Secondary colors are created using primary colors is true or false

secondary colors are created using primary colors is true or false

True

The lethal effect of injecting a potassium solution into a person's bloodstream is best explained by answer choice:

c. Potassium dissipates the electrochemical gradient in cardiac muscle cells, preventing them from contracting.

Explanation: In the human body, the concentration of potassium (K+) is maintained at a higher level inside cells compared to outside, while sodium (Na+) concentration is higher outside the cells than inside. This difference in concentration across the cell membrane creates an electrochemical gradient which is essential for several cellular activities, most notably the generation of action potentials in neurons and muscle cells, including those in the heart.

An action potential is a brief reversal of this membrane potential, where the inside of the cell becomes more positively charged than the outside. It is crucial for cell communication, especially in nerve and muscle cells.

When injected into the bloodstream, a high concentration of potassium disrupts this electrochemical gradient. This is particularly dangerous for the heart, as the changed potassium concentrations impair the generation of action potentials in cardiac cells.

Normally, during an action potential, sodium channels open first and allow influx of Na+ which makes inside of the cell positively charged. Then, potassium channels open to let K+ ions out, making the inside of the cell negative again and restoring the resting membrane potential. This whole process enables a heartbeat.

With too much potassium present outside the cells, potassium channels would not be able to effectively reset the membrane potential by letting potassium out. As a result, cardiac muscle cells would struggle to properly generate new action potentials, seriously hampering their ability to contract and relax normally.

This failure of normal heart rhythm, or cardiac arrhythmia, can quickly become fatal as the heart can't effectively pump blood through the body, depriving organs and tissues of the oxygen they need to function. Hence, why potassium injection can be lethal.

The other options do not fully or correctly describe this fatal effect of excess potassium. Therefore, they are not the correct answer for this question.

B. to create new primary sources that will one day be helpful to later historians

B. to create new primary sources that will one day be helpful to later historians