As an essential element in living organisms, _ ion is playing an important role in insulin secretion, the release of neurotransmitters, muscle contraction, and heartbeat regulation.
Correct answer: C. Calcium
- A. Sodium
- B. Potassium
- C. Calcium
- D. Chloride
Explanation
Calcium ions are critical in facilitating the release of neurotransmitters and insulin. They enter cells in response to specific signals and promote vesicular transport to the cell membrane, culminating in exocytosis. Additionally, calcium ions interact with proteins like troponin, playing a pivotal role in muscle contraction. Sodium and potassium are essential for nerve impulse transmission, while chloride maintains fluid and pH balance but does not directly influence insulin secretion or neurotransmitter release.
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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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