People suffering from AIDS have a weakened immune system. Because of their disease, people who have AIDS are
A) more vulnerable to the risk of nitrogen in the air.
B) less vulnerable to the risk of bacteria in the air.
C) more vulnerable to bacteria that are less of a risk to healthy people.
D) less vulnerable to any type of fungal, bacterial, or viral infection.
Question 2
Biologists advising park rangers wondered how best to dispose of human wastes in order to avoid harmful transmission of disease at remote camping sites along a turbulent river.
Every year thousands of people canoe down the river and are required to stay at predetermined campsites. These remote locations are not accessible by road or any large boat. Which of the following strategies of managing human waste would have the least impact on the environment? A) Encourage people to urinate in the river and carry out solid human waste in special biodegradable bags to later be disposed of as hazardous waste.
B) Require everyone to dig their own latrine and bury their own waste when they are done.
C) Accumulate all human wastes in large tanks, seal them permanently, and bury them when they are full.
D) Allow people to leave all human wastes on the ground as long as they are out of sight.
An example of a two-component regulatory system in bacteria
Summary of events in a typical humoral immune response.
Divisions of the nervous system.
Anatomy of the respiratory system
Receptors in the Autonomic Nervous System
Organ System Interactions