You duck your head when a baseball is thrown toward your face. You are responding to:
Correct answer: B. An external stimulus
- A. An internal stimulus
- B. An external stimulus
- C. Hormones
- D. All of these
Explanation
An external stimulus is the one which the organism receives from its external environment.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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