Active transport through a protein channel.
The type of fat which is most likely a solid at room temperature would be saturated fat. If you think of olive oil and canola oil, both of them are liiquid at room temperature. If you're thinking of lard, it's hard at room temperature.
These cells control blood glucose concentration by producing the antagonistic hormones insulin and glucagon: Beta cells secrete insulin
You can draw a free body diagram with two 250N forces acting on the human, one from each side. The net force is 0 because the two applied forces cancel each other out since they are in opposite directions.
