[Solved] Why does an electrical charge or membrane potential exist across nerve cell membranes? A)The cell membrane is permeable to sodium ions. B)The cell membrane allows more positively charged ions to leak out of the cell than to leak in. C)The membrane is impermeable to all ions. D)Water can flow freely across the membrane. Experimental Group: is the group in an experiment that receives the variable being tested, allowing researchers to observe the effects of that variable. Sexual Thought: Mental reflections or fantasies about sexual activity or erotic situations. Explicit Sexual Content: Material that depicts sexual activities or genitalia in a very direct and clear manner, intended for adult audiences. Word-Completion Task: A cognitive assessment activity where individuals fill in the blanks within words based on cues, testing memory or processing ability.