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Indicate Whether the Statements Below Are TRUE or FALSE

Question 63

Matching

Indicate whether the statements below are TRUE or FALSE.If a statement is false, explain why it is false

Premises:

Responses:

The primary mechanism by which Ca²⁺ acts as a signaling molecule is by increasing the net charge in the cytosol.

False

The extracellular concentration of Ca²⁺ is approximately 10⁴-fold higher than the concentration of Ca²⁺ in the cytosol.

True

Cytosolic Ca²⁺ concentration is kept low by the use of chelators such as EDTA.

The low cytosolic Ca²⁺ concentration sensitizes the cell to an influx of Ca²⁺, ensuring a rapid response to environmental stimuli.

Premises:

The primary mechanism by which Ca²⁺ acts as a signaling molecule is by increasing the net charge in the cytosol.

The extracellular concentration of Ca²⁺ is approximately 10⁴-fold higher than the concentration of Ca²⁺ in the cytosol.

Cytosolic Ca²⁺ concentration is kept low by the use of chelators such as EDTA.

The low cytosolic Ca²⁺ concentration sensitizes the cell to an influx of Ca²⁺, ensuring a rapid response to environmental stimuli.

Responses:

False

True

Correct Answer:

Premises:

Responses:

The primary mechanism by which Ca²⁺ acts as a signaling molecule is by increasing the net charge in the cytosol.

The extracellular concentration of Ca²⁺ is approximately 10⁴-fold higher than the concentration of Ca²⁺ in the cytosol.

Cytosolic Ca²⁺ concentration is kept low by the use of chelators such as EDTA.

The low cytosolic Ca²⁺ concentration sensitizes the cell to an influx of Ca²⁺, ensuring a rapid response to environmental stimuli.