7th Grade

Unit 3: Organisms Internal Responses

Lesson 1: Feeling Bad Can Sometimes Be

Good

Vocabulary of Instruction:

External Stimulus

• A change in an organism’s surroundings that causes the organism to react.

Forest Fire Logging

Fever• A rise in the

temperature of the human body; frequently a symptom of infection.

Normal Body Temperature =

98.6oF or 37.5oC

Homeostasis• Is the self-

regulation of the internal environment of living organisms or cells.

Hunger• A natural

physiological need for food.

Internal Stimulus• A change from

within an organism, such as hunger and thirst, that causes the organism to respond.

Response• An action or change in behavior that occurs as a result of a stimulus.

Stimulus• Is any factor that triggers a response from your senses.

Sunlight Cold

Heat Pain

Thirst• A natural physiological need to drink.

Vomit• The reflex act of ejecting the contents of the stomach through the mouth.