Which of the following is responsible for holding the lungs to the thorax wall? a. the visceral pleurae and the changing volume of the lungs b. the diaphragm and the intercostal muscles alone c. the smooth muscles of the lung d. surface tension from pleural fluid and negative pressure in the pleural cavity

d) Surface tension from pleural fluid and negative pressure in the pleural cavity

Explanation:

Pleural cavity can be described as the space which is present in between the pleura. Pleura can be described as the two thin membranes surround the lungs. These pleural cavity is responsible for holding the lungs to the thorax wall. It aids the functioning of the lungs at the time of breathing. It acts as a lubricant at the time of respiratory movements. Hence, the correct option is d.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.