1. Tardigrade
  2. Question
  3. Biology
  4. Which of the following is the main intracellular ion involved in nerve impulse transmission?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Which of the following is the main intracellular ion involved in nerve impulse transmission?

JIPMERJIPMER 2015Neural Control and Coordination

Solution:

Potassium ions K+, are the main cations in intracellular fluids. They contribute to the transmission of nerve impulses and muscle contraction. Calcium ions (Ca2+), are the most abundant cations in the body, making up about 1.5% of total body weight. About 99% is found in bones and teeth. They combine with phosphate ions to form calcium phosphate which increases the rigidity and hardness of bones and the enamel in teeth. Calcium ions are also involved in blood clotting, normal muscle contraction and nerve activity. Sodium ions (Na+), are main cations in extracellular fluids. They affect the transport of water through cell membranes by osmosis. They are also involved in transmission of nerve impulses and muscle contraction. Magnesium ions (Mg2+), are important because of their role in the normal functioning of muscle and nerve tissues, bone formation and as a component of many coenzymes.