Question

which of the following body systems have a main role in eliminating waste? select three correct answers.
a. endocrine system
b. urinary system
c. nervous system
d. respiratory system
e. immune system
f. digestive system

Explanation:

1. Urinary system: Filters and excretes liquid metabolic wastes (urea, excess water/electrolytes) via urine.
2. Respiratory system: Eliminates gaseous waste (carbon dioxide) produced by cellular respiration, expelled during exhalation.
3. Digestive system: Eliminates indigestible food matter and some metabolic waste products as feces after nutrient absorption.

The endocrine system regulates bodily functions, the nervous system controls signals, and the immune system fights pathogens; none of these have waste elimination as a main role.

Answer:

b. Urinary system
d. Respiratory system
f. Digestive system