Examlex
The first "big idea" in science standards revolves around systems, order, and organization. Which of the following is NOT an example of a system in this standard?
Calcium Channel
Calcium channels are protein-based channels within cell membranes that selectively allow calcium ions to move into or out of a cell, playing critical roles in various physiological processes including muscle contraction, neurotransmission, and gene expression.
Myelin Sheath
A fatty layer that surrounds nerve fibers, providing insulation and increasing the speed of electrical transmission along the neuron.
Receptor
A protein on the surface of a cell or inside it that binds to specific molecules, triggering a specific effect in the cell, such as a response to hormones or neurotransmitters.
Neurotransmitters
Chemical substances that transmit signals across a synapse from one neuron to another neuron or muscle or glandular cell.
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