A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Definitions H

Habit. A learned behavior that is a typical or customary pattern of response.

Habituation. The process by which a person’s response to a feared stimulus is reduced over time following repeated exposure.

Heredity. The genetic transmission of characteristics from parents to children.

Homeostasis. The tendency of an organism to maintain a steady state that permits a constant level of physiological functioning.

Hormone. A product of an endocrine gland that is released into the blood that regulate development and activity in target tissues somewhere else at a distance in the body. Steroid hormones include cortisol, estrogen, and testosterone. Non-steroid hormones include choleckystokinin, epinephrine, dopamine, insulin, norepinephrine, serotonin, and vasopressin.

Hostility. An emotional reaction that involves the thought and/or intent to destroy or damage something that is perceived as a threat.

Housebound. An inability to leave one’s house. Common in severe cases of panic, agoraphobia, and obsessive compulsive disorder. Can also occur in social phobia.

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