Veins

Veins are an important part of the circulatory system in the human body. They are blood vessels that carry blood back to the heart. Unlike arteries, veins carry blood at a lower pressure.

Structure of Veins

Veins have a thinner wall compared to arteries. They also have valves that help prevent the backflow of blood. The valves open to allow blood to flow towards the heart and then close to prevent it from flowing backwards.

Function of Veins

The main function of veins is to transport deoxygenated blood back to the heart and lungs to get re-oxygenated. Once the blood is oxygenated, it is pumped back out to the body through the arteries.

Study Guide

Key Points:

Veins carry blood back to the heart.
They have thinner walls compared to arteries.
Veins have valves to prevent backflow of blood.

Questions to Consider:

What is the main function of veins?
How do the valves in veins help in the circulation of blood?
How are veins different from arteries?

Activities:

1. Draw a diagram of the circulatory system and label the veins.

2. Role-play the circulation of blood through the veins, heart, and lungs with a friend.

◂Science Worksheets and Study Guides Third Grade. Work and machines

Vocabulary/Answer key

Work and machines

The resources above cover the following skills:

Concepts of Physical Science (SB1, SB2, SB3, SB4)

The student demonstrates an understanding of motions, forces, their characteristics, relationships, and effects by recognizing that objects can be moved without being touched (e.g., using magnets, falling objects, static electricity).

Concepts of Physical Science: A student should understand and be able to apply the concepts, models, theories, universal principles, and facts that explain the physical world. A student who meets the content standard should:

Develop an understanding of motions, forces, their characteristics and relationships, and natural forces and their effects.