Two Systems
In this section, you will learn about two body systems. The excretory system removes waste from the body. The respiratory system removes carbon dioxide, which is one form of waste, from the body.
Along with carbon dioxide, a major form of waste is urine, which is removed by the urinary system. This is important because removing waste is a crucial function of the body.
The Excretory System
The excretory system is responsible for removing waste products and excess substances from the body to maintain a healthy internal environment. Key organs in this system include the kidneys, which filter the blood to produce urine; the ureters, which transport urine to the bladder; and the bladder, where urine is stored before being excreted through the urethra. The excretory system also involves the skin, which removes waste through sweat, and the lungs, which expel carbon dioxide. Together, these parts work to eliminate toxins, balance water and salt levels, and keep the body functioning properly.
Scientific Concepts:
- The parts of the respiratory system and what they do
- The path air takes as it goes into and out of the body
- The way pressure affects breathing
- The major parts of the excretory system and the other systems the organs of the excretory system belong to
- Common diseases of the respiratory and excretory systems
The Respiratory System
The human respiratory system is responsible for bringing oxygen into the body and removing carbon dioxide, a waste product of the cells. It includes important organs like the nose, trachea, lungs, and diaphragm, which work together to help us breathe.
When we inhale, air enters our lungs, where tiny structures called alveoli transfer oxygen into the blood. At the same time, carbon dioxide from the blood is released into the air we exhale. This system is essential for providing the energy our bodies need to survive and keeping every cell in the body functioning properly.
Let's start with a science lesson with a biologist to explore how it works!
