Use the figure below to answer the following questions. 
Figure 2.2.1
-In Figure 2.2.1,the curve labelled A is the ________ curve and the curve labelled B is the ________ curve.
Definitions:
Injection Procedure
A medical method involving the introduction of liquids into the body via a needle and syringe, such as vaccines or medications.
Heart Rate Acceleration
An increase in the speed of heartbeats per minute, which can occur due to exercise, stress, excitement, or medical conditions.
Amphetamine
A potent central nervous system stimulant, used medicinally and recreationally, which can enhance alertness and energy.
Unconditioned Stimulus
A stimulus that naturally and automatically triggers a response without prior conditioning in classical conditioning paradigms.
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