When Troponin Binds Calcium

question 116

Multiple Choice

When troponin binds calcium,

• A) it allows tropomyosin to bind actin.
• B) ion channels open, and sodium rushes into the muscle cells.
• C) it changes conformation, twisting tropomyosin and exposing the actin-myosin binding site.
• D) it changes conformation, exposing the ATP binding site and allowing the actin-myosin bond to break.
• E) it binds to calmodulin and starts a cascade by activating myosin kinase.

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Definitions:

Positive Pulses

Short bursts of electrical energy that have a higher voltage level than the ground or reference point, often used in digital and electronic signaling.

Compound Motor

A type of DC motor that combines both series and shunt winding to offer high starting torque and good speed regulation.

Series and Shunt

Terms used to describe configurations in electrical circuits; "series" refers to components connected end-to-end, while "shunt" refers to components connected parallel to each other.

Constant Speed Motor

A motor that maintains a uniform speed under varying loads, often achieved through feedback mechanisms or specialized designs.