Questions: The degree to which a muscle cell can stretch depends on its: distensibility. contractility. excitability. conductivity.

The answer is the first one: distensibility.

Explanation for each option:

1. Distensibility: This is the correct answer. Distensibility refers to the ability of a muscle cell to be stretched or extended. It is a key property that allows muscles to lengthen when necessary.

2. Contractility: This refers to the ability of a muscle to contract or shorten forcefully. It is not related to the muscle's ability to stretch.

3. Excitability: This is the ability of a muscle cell to respond to stimuli, typically from nerve signals. While important for muscle function, it does not pertain to the muscle's ability to stretch.

4. Conductivity: This refers to the ability of a muscle cell to conduct electrical impulses. Like excitability, it is crucial for muscle function but not related to stretching.

In summary, the degree to which a muscle cell can stretch is determined by its distensibility.