Final answer:
The sodium-potassium pump is the option that has an effect on ventricular contraction. It maintains the resting potential of cells and establishes the concentration gradients of sodium and potassium ions.
Step-by-step explanation:
The correct option that has an effect on ventricular contraction is option B, the sodium-potassium pump.
The sodium-potassium pump is a transport protein found in the cell membrane of cells and it plays a crucial role in maintaining the resting potential of cells, including the ventricular muscle cells in the heart.
It requires energy in the form of ATP to pump three sodium ions out of the cell for every two potassium ions pumped into the cell.
This helps in establishing the concentration gradients of these ions, which are important for the generation of action potentials and subsequent ventricular contraction.