Question

give the answer fst please ​

Answer 1

Answer:

Question 14 Ans : OPTION D (ii and iv)

Question 15 Ans : OPTION D 'Nostrils →  Pharynx →  Larynx →  Trachea →  Alveoli'

Question 16 Ans : OPTION B Alveoli of lungs

Explanation:

Question 14

The percentage of carbon dioxide transported by hemoglobin is lesser than the carbon dioxide transported in dissolved state by plasma. The alveoli of the lungs increase the surface area for an efficient gaseous exchange between blood and alveolar air. The alveoli have thin walls made up of a single layer of an epidermis which allows easy exchange of gases.

So, the correct answer is option D

Question 15

The air is taken in the respiratory system via the nostrils in the nasal chamber. The air moves across the different parts of pharynx namely nasopharynx, oropharynx and laryngopharynx, from where it is directed to the larynx. The larynx is placed over the trachea, so air then moves to the trachea or windpipe. From the trachea, it travels through the bronchi, bronchioles and ultimately reaches the alveoli for exchange with blood.  Hence, the correct answer is 'Nostrils →  Pharynx →  Larynx →  Trachea →  Alveoli'

Question 16

Alveoli are the air sacs of the lungs. They have thin walls surrounded by blood capillaries (another layer of simple squamous epithelium). Gas exchange occurs in the alveoli. During inhalation, oxygen gas is in higher concentration in the alveoli than in the blood and so it diffuses into the blood through this thin layer of cells. During exhalation, carbon dioxide is in higher concentration in the blood than in the alveoli and so it diffuses into the alveoli through this thin layer of cells.

So, the correct answer is option B

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