The level of which of the following ions increases after fusion of the egg and sperm plasma membranes?Multiple choice question.K+Cl-Na+Ca2+
Question
The level of which of the following ions increases after fusion of the egg and sperm plasma membranes?
- K+
- Cl-
- Na+
- Ca2+
Solution
The ion that primarily increases in concentration after the fusion of the egg and sperm plasma membranes is Ca²⁺ (Calcium ion).
Explanation:
- Fusion Process: The fusion of the egg and sperm plasma membranes initiates several cellular responses, one of which is an increase in intracellular calcium levels.
- Role of Ca²⁺: The rise in Ca²⁺ concentration is crucial for various physiological processes, including the activation of metabolic pathways, triggering the completion of meiosis in the egg, and initiating embryonic development.
- Other Ions: While K⁺ (Potassium), Cl⁻ (Chloride), and Na⁺ (Sodium) are important ions in cellular functions, they do not show the same dramatic increase in concentration upon fertilization as Ca²⁺ does.
In summary, the correct answer to the multiple-choice question is Ca²⁺.
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