What Happens When Ca²⁺ Increases in the Cytoplasm of a Striated

question 4

Multiple Choice

What happens when Ca²⁺ increases in the cytoplasm of a striated muscle cell?

• A) Myosin-binding sites on actin are exposed, allowing a single cross-bridge cycle to occur.
• B) Myosin-binding sites on actin are exposed, allowing cross-bridge cycles to occur until Ca²⁺ drops again.
• C) Actin-binding sites on myosin are exposed, allowing a single cross-bridge cycle to occur.
• D) Actin-binding sites on myosin are exposed, allowing cross-bridge cycles to occur until Ca²⁺ drops again.

---

Definitions:

Error

The difference between a measured or observed value and the true, specified, or theoretically correct value, often used in the context of statistical or experimental analyses.

Sum of Squares

A statistical tool used to measure the total deviation of each observation from the mean of a data set, often used in variance and regression analysis.

Error

The difference between a measured or estimated value and the true value.

Slope

In mathematics, the rate of change or gradient of a line, indicating its steepness and direction.