Conditioned reflexes are a type of reflex that is acquired through learning and experience, as opposed to unconditioned reflexes, which are inborn. Pavlov introduced the concept of conditioned reflexes and divided reflexes into unconditioned and conditioned. Unconditioned reflexes are innate and not influenced by the environment, while conditioned reflexes are learned and depend on the environment. Conditioned reflexes are more complex and are found in higher animals, where the brain has a high degree of association between different centres and the ability to discriminate and judge. They are formed in association with well-established unconditioned reflexes and can be developed around a simple inborn reflex. The number and complexity of conditioned reflexes increase with the complexity of the nervous system. Conditioned reflexes can be positive or negative. Positive reflexes are excitatory and require the conditioned stimulus to precede and overlap with the unconditioned stimulus. Negative reflexes are inhibitory and are due to the cortex's ability to discriminate between stimuli. Conditioned reflexes obey certain physical laws, including summation, irradiation, specificity, discrimination, reinforcement, and linking. The cerebral cortex is the main organ responsible for conditioned reflexes, and its removal abolishes all conditioned reflexes. The reflex arc consists of three parts: the analyser, the connection, and the effector. Conditioned reflexes are important for understanding the activity of the central nervous system and have applications in human behavior, training, and education. They are related to the formation of habits and the ability of individuals to adapt to their environment. The study of conditioned reflexes also shows the plastic adaptability of the central nervous system. The International Union against Tuberculosis has held conferences to discuss the scientific status of tuberculosis and its prevention and treatment. The Union serves as a platform for collaboration among nations and includes activities such as conferences, meetings, publications, and affiliated activities. The Bulletin is the main communication tool for the Union. The Union also has a commission that has issued a report on post-sanatorial assistance and rehabilitation.Conditioned reflexes are a type of reflex that is acquired through learning and experience, as opposed to unconditioned reflexes, which are inborn. Pavlov introduced the concept of conditioned reflexes and divided reflexes into unconditioned and conditioned. Unconditioned reflexes are innate and not influenced by the environment, while conditioned reflexes are learned and depend on the environment. Conditioned reflexes are more complex and are found in higher animals, where the brain has a high degree of association between different centres and the ability to discriminate and judge. They are formed in association with well-established unconditioned reflexes and can be developed around a simple inborn reflex. The number and complexity of conditioned reflexes increase with the complexity of the nervous system. Conditioned reflexes can be positive or negative. Positive reflexes are excitatory and require the conditioned stimulus to precede and overlap with the unconditioned stimulus. Negative reflexes are inhibitory and are due to the cortex's ability to discriminate between stimuli. Conditioned reflexes obey certain physical laws, including summation, irradiation, specificity, discrimination, reinforcement, and linking. The cerebral cortex is the main organ responsible for conditioned reflexes, and its removal abolishes all conditioned reflexes. The reflex arc consists of three parts: the analyser, the connection, and the effector. Conditioned reflexes are important for understanding the activity of the central nervous system and have applications in human behavior, training, and education. They are related to the formation of habits and the ability of individuals to adapt to their environment. The study of conditioned reflexes also shows the plastic adaptability of the central nervous system. The International Union against Tuberculosis has held conferences to discuss the scientific status of tuberculosis and its prevention and treatment. The Union serves as a platform for collaboration among nations and includes activities such as conferences, meetings, publications, and affiliated activities. The Bulletin is the main communication tool for the Union. The Union also has a commission that has issued a report on post-sanatorial assistance and rehabilitation.