Veins

Veins are blood vessels that carry blood towards the heart. They play a crucial role in the circulatory system, working in conjunction with arteries and capillaries to transport oxygen-depleted blood back to the heart and lungs for re-oxygenation.

Structure of Veins

Veins are composed of three main layers: the tunica intima, the tunica media, and the tunica externa. The tunica intima is the innermost layer and is composed of endothelial cells. The tunica media is the middle layer and is made up of smooth muscle and elastic tissue. The tunica externa is the outermost layer, consisting of connective tissue.

Function of Veins

Veins function to transport deoxygenated blood from the body's organs and tissues back to the heart and lungs. They also serve as a reservoir for blood, helping to regulate blood flow and maintain blood pressure.

Study Guide

What is the function of veins in the circulatory system?
What are the three main layers of veins?
How do veins differ from arteries?
What is the role of veins in regulating blood flow and pressure?

◂Science Worksheets and Study Guides First Grade. All about animals

Vocabulary/Answer key

All about animals

The resources above cover the following skills:

Concepts of Life Science (SC1, SC2, SC3)

The student demonstrates an understanding of the structure, function, behavior, development, life cycles, and diversity of living organisms by observing and comparing external features of plants and of animals that may help them grow, survive, and reproduce.

Concepts of Life Science: A student should understand and be able to apply the concepts, models, theories, facts, evidence, systems, and processes of life science. A student who meets the content standard should:

Develop an understanding of the structure, function, behavior, development, life cycles, and diversity of living organisms.