Chapter 7: Transportation in Animals and Plants

The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it. The heart has four chambers. The two upper chambers are called the atria (singular: atrium), and the two lower chambers are called the ventricles. The partition between the chambers helps to avoid mixing up blood-rich in oxygen with the blood-rich in carbon dioxide. Blood flows from the heart to the lungs and back to the heart, from where it is pumped to the rest of the body.

When the cells in the body perform their functions, certain waste products are released. These are toxic and hence need to be removed from the body.

Students studying in Class 7 are advised to follow good study materials. NCERT textbooks are one of the most preferred study materials for the 7th standard students. They provide precise and well-defined explanations of all concepts with visual aid and experiments. Referring to the Science