5. How does heart avoid mixing of blood?
6. Why do arteries have thick wall?
7. Select the odd one out giving reason.
Urea, uric acid, amino acid, carbohydrate
8.How do aquatic animals like fishes excrete their waste?
9. Why aquatic animals like sponges and hydra do not posses blood?
10. What kind of blood is carried by capillaries?
Answers
Answer:
5. by having separate chambers inside it.......
sorry don't know about others.....
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Answer:
Explanation:
5) Blood without oxygen coming back to the heart from other areas of the body enters into the right side of the heart and goes into the lungs. Blood that has been oxygenated by the lungs enters into the left side of the heart and is pumped back out into the body.
6) Arteries are thick walled because they need much pressure to pump the blood throughout the body and thick walls provide that pressure. ... The pressure in our arteries is more than in veins as the blood has to reach throughout our body.
7) its not clear
8) The way in which waste product are excreted from the body of an animal depends on the availability of water to it. Aquatic animals live in water, so they excrete cellular waste in gaseous form as ammonia which directly dissolves in water.
9) Animals such as sponges and Hydra do not posses any circulatory system. The water in which they live brings food and oxygen as it enters their bodies. The water carries away waste materials and carbon dioxide as it moves out. Thus, these animals do not need a circulatory fluid like the blood.
10) Capillaries connect the arteries to veins. The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs. The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart.
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