Which of the Following Statements Is TRUE Regarding Skeletal-Muscle Contraction

question 9

Multiple Choice

Which of the following statements is TRUE regarding skeletal-muscle contraction?

• A) Only one cross-bridge cycle can occur when the [Ca²⁺] is elevated in the cytosol; in order to undergo a second cycle, [Ca²⁺] must be sequestered in the sarcoplasmic reticulum and released again.
• B) ATP hydrolysis products must be removed from myosin before it can bind to actin.
• C) Binding of myosin to actin takes place when [Ca²⁺] increases in the cytosol.
• D) A single twitch in skeletal muscle lasts the same length of time as the action potential that causes it.
• E) The powerstroke of the cross-bridge cycle occurs simultaneously with ATP being hydrolyzed into ADP and P_i.

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Definitions:

Bipolar Cells

Neurons located in the middle layer of the retina that act as intermediaries between photoreceptor cells (such as rods and cones) and ganglion cells, playing a crucial role in the primary processing of visual information.

Amacrine Cells

Neurons found in the retina that operate at the inner synaptic layer and play a critical role in the regulation of visual signal processing and the integration of visual information.

Horizontal Cells

Neurons located in the retina that help integrate and regulate the input from multiple photoreceptor cells, playing a key role in visual processing.

Ganglion Cells

Neurons located in the retina that process visual information and send it to the brain.