Question

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Answer 1

Answer:

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• Alveoli are tiny balloon shaped structures

• Valves present in the heart and veins prevent the backflow of blood, that is, flow of blood in the direction opposite to that in which it is flowing.

• the upper chambers of heart have right and left atria,which receives incoming blood . the right auricle receives de-oxygenated blood from the body and pumps it to the right ventricle (the lower chamber). the left auricle receives oxygenated blood from the lungs and pumps it to the left ventricle

• Salivary amylase

• Mitochondria

Explanation:

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Answer 2

Answer:

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Explanation:

Ans 1. The lung alveoli are the balloon-like air sacs loacted at the distal ends of the bronchial tree. There are as many as 700 million alveoli in each lungs, where they facilitate gaseous exchange of oxygen and carbon dioxide between inhaled air and the bloodstream.

Ans 2.The main function of the valves in veins is to prevent back flow of blood. Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins so there is no need for valves in arteries to prevent back flow.

Ans 3.the upper chambers of heart have right and left atria,which receives incoming blood . the right auricle receives de-oxygenated blood from the body and pumps it to the right ventricle (the lower chamber). the left auricle receives oxygenated blood from the lungs and pumps it to the left ventricle (the lower chamber).

Ans 4.The pancreas produces the key digestive enzymes of amylase, protease, and lipase. People with exocrine pancreatic insufficiency (EPI) have a deficiency of these enzymes and so are unable to digest food properly, especially fats.

Ans 5.The cell organelle in which breakdown of pyruvate to give carbon dioxide, water and energy takes place is Mitochondria.

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