Which one is NOT true for coordination in animals?
Correct answer: D. In the nervous system, secretory chemicals are released in the blood, while in the hormonal system, secretory chemicals are released in extracellular fluids
- A. Transmission by the nervous system is short-lived, whereas transmission by the hormonal system is long-lasting
- B. The nervous system uses electrical impulses to send signals through neurons, whereas hormonal coordination uses chemical messengers transported in the blood
- C. Responses are often permanent in the hormonal system, but temporary and reversible in the nervous system
- D. In the nervous system, secretory chemicals are released in the blood, while in the hormonal system, secretory chemicals are released in extracellular fluids
Explanation
The correct answer is Option D. In the nervous system, neurotransmitters are released at synapses between neurons, not into the bloodstream. Hormones, however, are released into the blood by endocrine glands. The other options correctly describe the characteristics of the nervous and hormonal systems in terms of signal duration, nature of transmission, and response permanence.
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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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