The diagram shows a simple piece of apparatus that can be used to demonstrate some of the events involved in human ventilation. Which events occurring during ventilation will be demonstrated by pulling the rubber diaphragm downwards, as shown by the arrow?
1 diaphragm relaxes
2 diaphragm contracts
3 volume of thorax increases
4 volume of thorax decreases
5 pressure in thorax increases
6 pressure in thorax decreases

Answer:

17) F

When diaphragm flattens, it contracts. So statement 2 is correct.

Volume of thorax increases. So statement 3 is correct.

Pressure decreases so statement 6 is correct.

F is the answer.