The Binding Affinity of ACh for Its Fetal Receptors at the Site

question 1

Multiple Choice

The binding affinity of ACh for its fetal receptors at the site of innervation vs. that at the end-plate in adult muscle is likely because of the

• A) sheer number of receptors that can occupy the respective sites.
• B) different subunit composition of between the fetal and adult forms of the receptor.
• C) density of the receptors at the site of innervation between the fetal and adult forms of the receptor.
• D) size of the presynaptic terminal.
• E) differences in surface area between the fetal and adult sites of innervation.

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