Section 1
The Heart Pumps Blood Through Two Systems
The heart functions as two pumps - the right side sends oxygen-poor blood to the lungs, while the left side delivers oxygen-rich blood throughout the body via arteries, capillaries, and veins.
In this Grade 7 Life Science lesson from Chapter 19, students learn how the circulatory system transports oxygen, nutrients, and wastes throughout the body. The lesson covers the structure and function of key components including the heart's chambers (atria and ventricles), blood vessels (arteries, veins, and capillaries), and blood composition (plasma, red blood cells, white blood cells, and platelets). Students also explore how the circulatory system works together with the respiratory and digestive systems to maintain the body's needs.
Section 1
The Heart Pumps Blood Through Two Systems
The heart functions as two pumps - the right side sends oxygen-poor blood to the lungs, while the left side delivers oxygen-rich blood throughout the body via arteries, capillaries, and veins.
Section 2
Blood Carries Essential Materials Throughout Your Body
Blood consists of plasma, red blood cells that transport oxygen, white blood cells that fight infection, and platelets that help form clots when blood vessels are injured.
Section 3
Blood Vessels Create Networks for Material Exchange
Arteries carry blood away from the heart with thick, elastic walls. Veins return blood to the heart, while tiny capillaries connect them, allowing oxygen and nutrients to reach cells.
Section 4
Blood Pressure Forces Materials Through Your Body
The heart's contractions create pressure on blood vessel walls. Healthy blood pressure ensures all cells receive oxygen and nutrients. Pressure is measured as two numbers during heart contraction and relaxation.
Section 5
Exercise Increases Your Heart's Pumping Rate
When you exercise, your heart beats faster to deliver more oxygen to active muscles. Finding your target heart rate (60-75% of maximum) helps you exercise safely and effectively.
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Section 1
The Heart Pumps Blood Through Two Systems
The heart functions as two pumps - the right side sends oxygen-poor blood to the lungs, while the left side delivers oxygen-rich blood throughout the body via arteries, capillaries, and veins.
Section 2
Blood Carries Essential Materials Throughout Your Body
Blood consists of plasma, red blood cells that transport oxygen, white blood cells that fight infection, and platelets that help form clots when blood vessels are injured.
Section 3
Blood Vessels Create Networks for Material Exchange
Arteries carry blood away from the heart with thick, elastic walls. Veins return blood to the heart, while tiny capillaries connect them, allowing oxygen and nutrients to reach cells.
Section 4
Blood Pressure Forces Materials Through Your Body
The heart's contractions create pressure on blood vessel walls. Healthy blood pressure ensures all cells receive oxygen and nutrients. Pressure is measured as two numbers during heart contraction and relaxation.
Section 5
Exercise Increases Your Heart's Pumping Rate
When you exercise, your heart beats faster to deliver more oxygen to active muscles. Finding your target heart rate (60-75% of maximum) helps you exercise safely and effectively.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter