There are 25 million to a billion different T-cells in your body. Each cell has a unique T-cell receptor that can fit with only one kind of antigen, like a lock that can fit with only one shape of key. Antigens and receptors work a lot like a lock and key. Each of the 25 million to a billion different T-cells fit with a different shape of antigen.
Motivating operation. Motivating operation (MO) is a behavioristic concept introduced by Jack Michael in 1982. It is used to explain variations in the effects in the consequences of behavior. Most importantly, a MO affects how strongly the person is reinforced or punished by the consequences of their behavior.
Operant Conditioning deals with operants-intentional actions that have an effect on the surrounding environment. Skinner set out to identify the processes which made certain operant behaviours more or less likely to occur. Skinner's theory of operant conditioning was based on the work of Thorndike (1905).Edward Thorndike studied learning in animals using a puzzle box to propose the theory known as the ' Law of Effect '.kinner identified three types of responses or operant that can follow behavior. â¢ Neutral operants: responses from the environment that neither increase nor decrease the probability of a behavior being repeated. â¢ Reinforcers: Responses from the environment that increase the probability of a behavior being repeated.