A picture from the episode "Physical Attraction, Chemical Reaction."
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Erica Hahn puts Mark Sloan in his place awfully quickly at Joe's when he tries to act upon his "thing" for her.
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... the sex. That's what Alex tells Lexie Grey. But in the end he ends up on Team Meredith. Of course, she backs off her bitchiness a little bit as well.
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Drs. Shepherd, Yang and Grey (the younger) consult with a man about an important medical decision to be made. From "Physical Attraction, Chemical Reaction."
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Lexie does everything she can for a small patient ... but will it be enough? We will have to wait and see.
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Derek Shepherd (Patrick Dempsey), Lexie Grey (Chyler Leigh) and Cristina Yang (Sandra Oh) in the episode called "Physical Attraction, Chemical Reaction," from Season Four of Grey's Anatomy.
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Derek and Lexie discuss a case with a patient and other staff members. We like these two together... so long as there's no romance involved!
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This new visitor to Seattle Grace wears an expression of great concern... and for good reason. Will his situation be resolved for the better?
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Grey's Anatomy Season 4 Episode 7 Quotes

Meredith: [narrating] Before we were doctors, we were med students, which meant we spend a lot of time of studying chemistry. Organic chemistry, biochemistry, we learned it all. But when you're talking about human chemistry only one thing matters: either you've got it or you don't.

Derek: What's new with you?
Meredith: I saw my half-sister half naked.