Excretory System
What is the main organ in the excretory system?
The kidneys
These structures crush food that has entered the mouth.
Teeth
These balloon like sacs inflate and deflate, bringing air into and out of the body.
Lungs
The control centre of the sensory system.
Brain
This stores the urine.
Bladder
Food travels down this long tube from the mouth to the stomach.
Esophagus
Small sacks in the lungs which allow oxygen and carbon dioxide to move between the lungs and blood stream.
Aveoli
The central nervous system is composed of the brain as well as this long structure that extends down the back and is the connector between the brain and all the nerves that branch out to the rest of the body.
Spinal cord
These carry the urine to the bladder.
Ureters
The millions of tiny finger-shaped structures that cover the inner surface of the small intestine and provide a large surface area through which digested food is absorbed.
Villi
This chemical is in the air we breathe and we need it to survive.
Oxygen
Bundles of fibers found throughout the body that sends electrical impulses to and from the brain to the other body structures.
Nerves
This carries the urine outside of the body during urination.
Urethra
These aid in digestion by speeding up chemical reactions.
Enzymes
This chemical is exhaled by animals, but plants "breathe" it in and use it to produce oxygen.
Carbon dioxide
The specialized cells that detect sensory information from the environment (e.g., receive the sensation of heat from the pan).
Receptors
These can be found in the bladder due to a buildup and crystalization of minerals.
Bladder stones
The process that pushes the food bolus down the esophagus.
Peristalsis
A disease in the lungs that can be caused by breathing in harmful chemicals. It leads to uncontrolled cell growth.
Lung cancer
What is an automatic response called?
A reflex