As Compared with a 20-Year-Old,how Much Do the Pupils Decrease

question 17

Multiple Choice

As compared with a 20-year-old,how much do the pupils decrease in size by the time a person reaches 60 years of age?

• A) 1/4
• B) 1/2
• C) 2/3
• D) 3/4

---

Definitions:

Stomach Contractions

The involuntary movements of the stomach muscles that mix and propel contents through the digestive system.

Ghrelin

A hormone produced mainly by the stomach that stimulates appetite and signals hunger to the brain.

Ghrelin

A hormone produced in the stomach that stimulates appetite, promoting the feeling of hunger before meals.

Leptin

A hormone produced by fat cells that helps to regulate body weight by inhibiting hunger and therefore reducing food intake.