pathogen An organism that causes disease in another organism; certain bacteria, viruses,
and fungi are pathogens of the respiratory system.
pertussis Whooping cough; gets its name from the loud whooping sound that is made
when the person inhales during a coughing fit.
pneumonia An illness in which the alveoli become inflamed and flooded with fluid.
respiratory disease A disease of the lungs, bronchial tubes, trachea, nose, and/or throat.
tuberculosis (TB) A common and often deadly infectious disease caused by a type of
bacterium calledmycobacterium.
Points to Consider
- The respiratory system gets rids of a certain type of wastes. What type of wastes do
you think are removed by your respiratory system?
19.3 Lesson 19.3: Excretory System
Lesson Objectives
- Identify the functions of the excretory system.
- List the organs of the excretory system.
- Describe the parts of urinary system.
- Outline how the kidneys filter blood.
- Identify three disorders of the urinary system.
Check Your Understanding
- What are some ”wastes” that must be removed from your body?
- Do your circulatory and respiratory systems remove ”waste?”
Introduction
One of the most important homeostatic jobs your body does it to keep the right amount of
water and salts inside your body. Too much water and your cells would swell and burst. Too
little water and your cells would shrivel up like an old apple. Either extreme would cause