The Entrainment of Circadian Rhythms by Visual Zeitgebers Is Mediated

question 18

Multiple Choice

The entrainment of circadian rhythms by visual zeitgebers is mediated by

• A) part of the optic nerve.
• B) the retinohypothalamic tract.
• C) a rare type of retinal ganglion cell.
• D) all of the above
• E) both A and C

---

Definitions:

Monopolistically Competitive

A market structure where many firms sell products that are similar but not identical, allowing for some degree of market power.

Pure Monopolist

A market structure where a single seller dominates, facing no competition in selling its products or services.

Economic Profit

The difference between a firm's total revenues and its total costs, including both explicit and implicit costs, indicating the firm's overall financial gain.

Excess Capacity

A situation where a company or economy can produce more goods than are being demanded, indicating underused resources.