Circulation

Circulation refers to the movement of blood through the body, facilitated by the heart, blood vessels, and blood. The circulatory system is crucial for transporting oxygen, nutrients, hormones, and waste products throughout the body, as well as regulating body temperature and pH levels.

Components of the Circulatory System

The circulatory system comprises the following components:

Heart: This muscular organ pumps blood throughout the body.
Blood Vessels: Arteries, veins, and capillaries form a network for blood flow.
Blood: This fluid contains red and white blood cells, platelets, and plasma.

Types of Circulation

There are two main types of circulation:

Pulmonary Circulation: This involves the flow of blood between the heart and the lungs, where oxygen is obtained and carbon dioxide is released.
Systemic Circulation: This encompasses the movement of oxygenated blood from the heart to the rest of the body, delivering oxygen and nutrients and removing waste products.

Functions of the Circulatory System

The circulatory system serves several essential functions, including:

Transporting oxygen and nutrients to cells
Removing carbon dioxide and waste products
Regulating body temperature
Supporting the immune system through the circulation of white blood cells
Transporting hormones and other signaling molecules

Study Guide Questions

What is the main function of the circulatory system?
Describe the components of the circulatory system.
How does pulmonary circulation differ from systemic circulation?
What role does the heart play in the circulatory system?
Explain how the circulatory system supports the immune system.

◂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).