Important Points and Formulas of class 7 Science Chapter-Transportation in Plants and Animals
Class 7 Science Chapter-Transportation in Plants and Animals
In the body of majority of animals, substances are transported from one part of the body to another through blood. Thus, blood is the “tissue for transport” and circulates throughout the body. Circulatory system consists of organs, which make blood circulate throughout the body. Blood transports nutrients, respiratory gases, hormones and waste material from one part of the body to another.
Human circulatory system consists of
Centrally located muscular pump called heart, and blood vessels, which are tube-like structures, connected to the heart.
Blood vessels are of three kinds:
- Arteries: Carry blood from heart to various parts of body.
- Veins: Bring blood from various parts of body to the heart.
- Capillaries: Thin vessels between the artery and the vein. The capillaries allow the exchange of materials between blood and tissues.
Blood is a connective tissue that circulates throughout the body. It is made up of a fluid medium called plasma in which three types of blood cells called red blood cells, white blood cells and blood platelets are present. Blood cells are manufactured in the bone marrow.
Functions of blood
- The digested and absorbed nutrients like glucose, amino acids, fatty acids are first transported to the liver and then to all the tissues for their storage, oxidation and synthesis of new substances.
- The respiratory gases (oxygen, carbon-dioxide) are transported by the blood. Oxygen is transported from the respiratory surface (lung, skin and buccal cavity) to the tissues and carbon dioxide is exchanged.
- Blood forms a clot at the site of injury and thus prevents the further loss of blood.
- The blood flows in all the parts of body, so it equalizes the body temperature. It carries heat from one place to another place in the body.
- The WBCs engulf the bacteria and other disease-causing organisms by phagocytosis.
- Different wastes from the different parts of the body are collected by the blood and then taken to the organs (kidneys, lungs, skin and intestine) from where they are excreted.
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Find Below Short Notes of chapter-Transportation in Plants and Animals