1. Anything that shows a graduated step like change. 2. Cardiac muscle. The increase in the force when a heart rate increases. 3. Skeletal muscle. The increase in contractions when a stimuli sequence is applied to a resting muscle.
1. Anything that shows a graduated step like change. 2. Cardiac muscle. The increase in the force when a heart rate increases. 3. Skeletal muscle. The increase in contractions when a stimuli sequence is applied to a resting muscle.