The Circulatory System

Key Notes :

What is the Circulatory System?

• The circulatory system is like a transportation system in our body. It moves blood, oxygen, and nutrients to every part of our body.

Main Parts of the Circulatory System

• Heart: The heart is a strong muscle that pumps blood throughout the body.

• Blood Vessels: These are like tiny tubes that carry blood. There are three main types:

• Arteries: Carry oxygen-rich blood away from the heart.
• Veins: Bring blood back to the heart.
• Capillaries: Very tiny vessels where the exchange of oxygen, nutrients, and waste happens.

How the Heart Works

• The heart has four chambers: two on the top (called atria) and two on the bottom (called ventricles).
• It pumps blood to the lungs to get oxygen, then sends this oxygen-rich blood to the rest of the body.

Blood

• Blood carries oxygen and nutrients to the cells and removes waste products like carbon dioxide.
• It also helps fight infections and keeps us healthy.

Why the Circulatory System is Important

• It provides the body with the oxygen and nutrients needed to survive.
• It helps remove waste products from the body.

Fun Facts

• The heart beats about 60-100 times per minute.
• An average adult has about 5 liters of blood in their body.
• Blood travels through the entire circulatory system in about one minute!

How to Keep Your Circulatory System Healthy

• Eat healthy foods like fruits, vegetables, and whole grains.
• Exercise regularly to keep the heart strong.
• Drink plenty of water to stay hydrated.
• Avoid too much junk food and sugary drinks.

Let’s practice!