Specialized Cells, Tissues, and Organs That Secrete Hormones Are Part

question 63

Multiple Choice

Specialized cells, tissues, and organs that secrete hormones are part of the

• A)digestive system
• B)endocrine system
• C)excretory system
• D)circulatory system
• E)immune system

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Definitions:

Biological Clocks

Mechanisms by which activities of organisms are adapted to regularly recurring changes in the environment. See circadian rhythm.

Feedback Loops

Systems within biological and ecological processes that regulate themselves through cycles of feedback information.

Sign Stimulus

A specific trigger from the environment that elicits an innate behavior in an animal.

Conditioned Stimulus

A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, can elicit a conditioned response in an organism.