Examlex
Which of the following is the original signal inhibited by Viagra?
Teenagers
Individuals in the stage of human life following childhood and preceding adulthood, typically ranging in age from 13 to 19 years.
Preschoolers
Children in the age group of approximately 3 to 5 years old, before they enter formal schooling, notable for rapid development in language, motor skills, and social interaction.
Psychoneuroimmunology
The study of the connections among stress, the body’s immune system, and illness.
Immune System
A complex network of cells, tissues, and organs that work together to defend the body against attacks by foreign invaders, such as bacteria, viruses, parasites, and fungi.
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