To Test the Effect of Vitamin D on Growth, Two

question 65

Multiple Choice

To test the effect of vitamin D on growth, two groups of rats were raised under identical conditions and fed the same diet. One of the groups received daily injections of vitamin D. The other group received injections of saline, which did not contain vitamin D. All the rats were weighed weekly for 2 months. In this experiment, the control was the:

• A)group receiving vitamin D.
• B)group receiving saline.
• C)average weight gain of the rats.
• D)2-month period of time.

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Definitions:

Afterpotential

The electrical changes that occur in a neuron immediately following an action potential, which can affect the neuron's ability to fire again.

Permeability

Permeability refers to the ability of a material or membrane to allow liquids or gases to pass through it.

Sodium-Potassium Pump

The sodium-potassium pump is a membrane-bound enzyme critical for cellular function, actively transporting sodium out of and potassium into cells, helping maintain cellular electrochemical gradients.

Action Potential

An action potential is a rapid electrical impulse that travels along the membrane of a neuron or muscle cell, facilitating communication and response.