Which of the following is a key difference between the endocrine system and the nervous system in terms of signaling?
The endocrine system uses hormones for signaling, while the nervous system uses neurotransmitters.
The endocrine system uses electrical signals, while the nervous system uses chemical signals.
The nervous system generates responses that take longer to occur compared to the endocrine system.
Both systems use hormones for signaling but at different speeds.
The Correct Answer is A
A. The endocrine system uses hormones for signaling, while the nervous system uses neurotransmitters.: The endocrine system releases chemical messengers (hormones) into the bloodstream that act on distant targets, while the nervous system transmits signals using neurons that release neurotransmitters at synapses for rapid, localized communication.
B. The endocrine system uses electrical signals, while the nervous system uses chemical signals.: The endocrine system relies on chemical hormones rather than electrical impulses; electrical signals are a primary feature of neuronal (nervous) communication.
C. The nervous system generates responses that take longer to occur compared to the endocrine system.: Nervous-system responses are typically rapid and short-lived because of fast electrical conduction and synaptic transmission, whereas endocrine responses are usually slower to start but longer-lasting.
D. Both systems use hormones for signaling but at different speeds.: While the endocrine system primarily uses hormones, the nervous system mainly uses electrical impulses and neurotransmitters; hormones can modulate neural function but the two systems do not both primarily use hormones.
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Related Questions
Correct Answer is A
Explanation
A. The endocrine system uses hormones for signaling, while the nervous system uses neurotransmitters.: The endocrine system releases chemical messengers (hormones) into the bloodstream that act on distant targets, while the nervous system transmits signals using neurons that release neurotransmitters at synapses for rapid, localized communication.
B. The endocrine system uses electrical signals, while the nervous system uses chemical signals.: The endocrine system relies on chemical hormones rather than electrical impulses; electrical signals are a primary feature of neuronal (nervous) communication.
C. The nervous system generates responses that take longer to occur compared to the endocrine system.: Nervous-system responses are typically rapid and short-lived because of fast electrical conduction and synaptic transmission, whereas endocrine responses are usually slower to start but longer-lasting.
D. Both systems use hormones for signaling but at different speeds.: While the endocrine system primarily uses hormones, the nervous system mainly uses electrical impulses and neurotransmitters; hormones can modulate neural function but the two systems do not both primarily use hormones.
Correct Answer is C
Explanation
A. The HPA axis directly controls the release of growth hormone.:Growth hormone release is regulated mainly by GHRH and somatostatin from the hypothalamus and feedback from IGF-1, not primarily by the HPA axis.
B. The HPA axis is responsible for regulating blood sugar levels through insulin secretion.:Insulin secretion is controlled by the pancreas in response to blood glucose; the HPA axis influences glucose metabolism indirectly via cortisol but does not control insulin release.
C. The HPA axis responds to stress by stimulating cortisol release from the adrenal glands.:The HPA axis (CRH → ACTH → cortisol) is activated by stress and results in increased cortisol production by the adrenal cortex.
D. The HPA axis regulates the secretion of thyroid hormones.:Thyroid hormone secretion is primarily regulated by the hypothalamic–pituitary–thyroid axis (TRH → TSH → T3/T4), not the HPA axis.
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