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Joystick

Joystick is a term used for the handhold tool used in many computer-based video games. The joystick is designed after the steering stick of military airplanes, allowing movement in all four directions as well as rotational movement. In addition, buttons with certain functions can be located at several positions on the joystick.

Junctional rhythm

Junctional rhythm is an impulse that travels anterogradely and retrogradely at the same time. Depending upon the rate of conduction in each direction, the P wave may be inscribed shortly in front of the ventricular complex, may follow the QRS, or it may be lost within it.

Jurkat

Jurkat is a human T-cell line grown in tissue culture. Often useful when large numbers of T-cells are necessary and the full complement of T-cell functions are not needed.