Final answer:
The movement of sodium, potassium, and calcium ions is involved in establishing and maintaining the resting membrane potential (RMP) in cardiac node cells.
Step-by-step explanation:
Establishing and maintaining the resting membrane potential (RMP) in cardiac node cells involves several options. The main options involved in this process are the movement of ions such as sodium (Na+), potassium (K+), and calcium (Ca2+). These ions play a crucial role in generating and regulating the action potential in cardiac node cells.
The first step in establishing the RMP is a slow influx of Na+ followed by a rapid influx of Ca2+ and outflux of K+. This process creates the necessary depolarization and repolarization phases that allow for the proper functioning of cardiac node cells. The movement of these ions is facilitated by ion channels present in the cell membrane.
Overall, it is the balanced movement of Na+, K+, and Ca2+ ions that helps in establishing and maintaining the RMP in cardiac node cells.