While basically any organ in your body has a function (aside perhaps of the appendix) the only "organ" in your arm that you could have removed without losing arm functions would be a lymphic node, which is part of your immune system.
Losing one of these nodes would lower the effectiveness of your immune system, but not cost you arm function.
It is a tentacle.
the bladder and lungs because they are not needed in the afterlife
The lungs
The Lungs
A sphygmomanometer, a device used to measure blood pressure, is typically used on the arm. It does not extend an individual's sense organ, but rather applies pressure to the arm to measure blood pressure.
The church organ
Not necessarily. Your biceps are not an organ, just muscle. Your arm isn't an organ, just a limb.
Just does. Deal with it.
It is a tentacle.
your mouth
The liver is an organ of the digestive system, it produces the chemicals needed for digestion.
Small Intestine
The humerus bone is the one in your upper arm, and it is needed when you want to move your arm.
the muscle, tissue, and possibly the bone
the one with the fulcrum closer to the weight you needed to lift
determined by the length of the lever arm and the weight of the load. The longer the lever arm, the less force is needed to lift the load. The force needed is inversely proportional to the length of the lever arm.
The Heart