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Chapter 4, Lesson 1
Transcript of Chapter 4, Lesson 1
The valve prevents blood from flowing backwards. They separate the atria from the ventricles and the large blood vessels that carry blood away from the heart.
How The Heart Works
The heart makes something like a
sound. The heart muscles relax then the atria fills with blood. Next, the atria contract, making blood to go through valves, and blood moves into the ventricles. The ventricles contract, and the valves close, and that causes the
sound. Finally, the valves between the ventricles and blood vessels snap shut, making the
How Blood Travels Through Your Body
The blood flows through two loops where the heart is at. In the first loop, blood travels from the heart to the lungs and then back to the heart. In the second loop, blood travels from the heart throughout the body and then back to the heart.
Arteries, carry blood away from the heart. For example, blood in the left ventricle is pumped into the
are the largest artery in the body.
From the arteries, blood flows into tiny vessels called
. In the capillaries substances are exchanged between the blood and body cells.
From capillaries, blood flows into veins, which carry blood back to the heart.