What is Excretion?

Excretion is the process of getting rid of waste substances from the body. These waste substances are produced during the body's activities and need to be removed to keep the body healthy.

Organs Involved in Excretion

The major organs involved in excretion are the kidneys, lungs, skin, and digestive system.

Kidneys: The kidneys filter waste products from the blood and produce urine, which is then excreted from the body.
Lungs: The lungs excrete carbon dioxide, a waste product of respiration, when we breathe out.
Skin: Sweat glands in the skin excrete sweat, which contains waste substances and helps regulate body temperature.
Digestive System: The digestive system excretes solid waste products in the form of feces.

The Importance of Excretion

Excretion is important because it helps the body get rid of harmful waste substances that can build up and cause illness. It also helps maintain the balance of chemicals and water in the body.

How to Keep Excretory Organs Healthy

To keep the excretory organs healthy, it is important to:

Drink plenty of water to help the kidneys function properly.
Eat a balanced diet to support the excretory functions of the body.
Exercise regularly to maintain overall health, which includes the health of excretory organs.
Practice good hygiene to keep the skin clean and prevent infections.

◂Science Worksheets and Study Guides Second Grade. What is science?

Vocabulary/Answer key

What is science?

The resources above cover the following skills:

LIFE SCIENCE

Ecosystems: Interactions, Energy, and Dynamics

Obtain information from literature and other media to illustrate that there are many different kinds of living things and that they exist in different places on land and in water (e.g., woodland, tundra, desert, rainforest, ocean, river).

EARTH AND SPACE SCIENCE

Earth’s Systems

Make observations from media to obtain information about Earth’s events that happen over a short period of time (e.g., tornados, volcanic explosions, earthquakes) or over a time period longer than one can observe (e.g., erosion of rocks, melting of glaciers).

Collect and evaluate data to identify water found on Earth and determine whether it is a solid or a liquid (e.g., glaciers as solid forms of water; oceans, lakes, rivers, streams as liquid forms of water).