According to the Sliding-Filament Model of Contraction, How Does Muscle

question 22

Multiple Choice

According to the sliding-filament model of contraction, how does muscle contraction occur?

• A) The myosin heads propel the actin myofilaments toward the center of the sarcomere; this pulls the Z disks closer together, which shortens the sarcomere and the entire muscle.
• B) The actin heads propel the myosin filaments toward the center of the sarcomere; this pulls the Z disks closer together, which shortens the sarcomere and the entire muscle.
• C) The myosin heads propel the actin myofilaments toward the center of the sarcomere. This causes the myofilaments to shorten, which pulls the Z disks closer together to shorten the sarcomere and the entire muscle.
• D) Both the actin and myosin myofilaments shorten, which shrinks the sarcomere and pulls the Z disks closer together. As the Z disks move closer together, the muscle contracts.

---

Definitions:

External Stimuli

Elements in the environment that influence behavior or responses, such as light, noise, or temperature.

Physical Attractiveness

Physical attractiveness refers to the degree to which a person's physical traits are considered aesthetically pleasing or beautiful, often influenced by cultural and social norms.

Happiness

A state of well-being and contentment, characterized by positive emotions ranging from contentment to intense joy.

Correlation

A statistical measure that indicates the extent to which two or more variables fluctuate together.