Q15 of 79 Page 48

During respiration exchange of gases take place in

The tiny air-sacs at the end of the smallest bronchioles are known as Alveoli. Alveoli is the place where gaseous exchange take place.

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13

Which of the following statement(s) is (are) true about respiration?

1. During inhalation, ribs move inward and diaphragm is raised


2. In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into


blood and carbon dioxide from blood into alveolar air


3. Haemoglobin has greater affinity for carbon dioxide than oxygen


4. Alveoli increase surface area for exchange of gases

 14

Which is the correct sequence of air passage during inhalation?

 16

Which of the following statement (s) is (are) true about heart?

1. Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs


2. Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs


3. Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts


4. Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body.

 17

What prevents backflow of blood inside the heart during contraction?