Which of the Following Statements About Excitation- Contraction Coupling in Skeletal

question 113

Multiple Choice

Which of the following statements about excitation- contraction coupling in skeletal muscle is FALSE?

• A)An end- plate potential triggers an action potential on the sarcolemma.
• B)DHP receptors on the T tubules detect changes in voltage and communicate to ryanodine receptors on the sarcoplasmic reticulum to open calcium channels.
• C)Calcium binds to troponin, causing a shift in tropomyosin, thereby exposing the binding sites on actin for myosin.
• D)Calcium ATPases in the sarcoplasmic reticulum are necessary for relaxation of the muscle.
• E)An action potential in the sarcolemma stimulates the opening of voltage- gated calcium channels in the plasma membrane and the sarcoplasmic reticulum.

---

Definitions:

Sensorineural Hearing Loss

A type of hearing loss resulting from damage to the inner ear or the auditory nerve pathways.

Malleus

The malleus is a small bone in the middle ear that transmits sound vibrations from the eardrum to the inner ear.

Lacrimal Fluid

The clear, watery fluid produced by the lacrimal glands in the eyes; it's commonly known as tears, serving to lubricate and protect the eye.

Lower Palpebrae

The lower eyelid, playing an essential role in protecting the eye from debris and aiding in tear distribution.