<prompt> Active tension in a muscle depends upon which of the followingNumber of muscle fibresNumber of motor units recruitedAerobic capacity of muscleAction potential amplitude  <response>: Active Tension in a muscle depends upon the number of motor units recruited. The greater the number of motor units recruited, the greater will be the active tension. Factors Determining Muscle Tension Active Tension Tension developed by each fiber Action potential frequency Fibre length Length-tension relationship Fibre length Fatigue Number of active fibers Number of fibers per motor unit Number of active motor units recruitment Ref: Vanders Human physiology: The Mechanisms of Body function 11th edition Pgno: 276 