Just does. Deal with it.
the muscle, tissue, and possibly the bone
The arm is not part of a single system; to construct an arm you need lots of systems, which includes the muscular, skeletal, circulatory, nervous, and integumentary systems.
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.
Not necessarily. Your biceps are not an organ, just muscle. Your arm isn't an organ, just a limb.
It is a tentacle.
In mechanical systems, the moment arm and lever arm both refer to the distance between the axis of rotation and the point where a force is applied. The moment arm specifically relates to the perpendicular distance, while the lever arm is the actual distance along the line of action of the force.
Skeletal system: The bones of the arm need to be correctly aligned and secured during reattachment surgery. Muscular system: Muscles and tendons in the arm need to be carefully reattached to ensure proper function. Circulatory system: Blood vessels must be reconnected to restore blood flow to the arm. Nervous system: Nerves in the arm must be repaired to restore sensation and movement. Integumentary system: The skin and other tissues need to be stitched back together to promote healing and prevent infection.
An inflatable arm cuff with a pressure meter on it and a stethoscope. Although many new automated systems are on the market now.
The Circulatory, Lyphatic, Integumentary, Muscular, and Nervous Systems.
The Heart
The muscular and skeletal systems work together in the arm to bend. The muscles, attached to the bones by tendons, contract to move the bones at the joints and create the bending motion.
nervous system