Q.17 Match the following: Column A Column B 1. Circulation 1. Used by dentists to see enlarge image of teeth. ii. Used as a magnifying glass. 2. Arteries and veins 3. Waste products iii. Movement of materials 4. A concave mirror 5. A convex mirror iv. Can poison an organism v. Pipes for transport in man
Answers
Answer:
The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen to every cell. After delivering the oxygen, the blood returns to the heart. The heart then sends the blood to the lungs to pick up more oxygen. This cycle repeats over and over again.
The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart.
The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide. These roadways travel in one
direction only, to keep things going where they should.
The heart has four chambers — two on top and two on bottom.
Explanation:
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