Question

I need someone to check my answers

Answer 1

1. In the image above of an alveolus, what is the identity of the two visible tissue layers labeled C and D.

C = inner wall of alveolar sac; D = outer wall of alveolar sac
C = inner wall of alveolar sac; D = outer capillary wall
C = outer wall of alveolar sac; D = outer capillary wall
C = inner capillary wall; D = outer capillary wall

I said C.

Answer 2

2. This image shows the inside of a human lung. There is a space between the alveolar sac and the capillary where oxygen and carbon dioxide diffuse between the lung and blood. Which structures form this blood-air barrier?

Structures A and B
Structures B and C
Structures C and D
Structures D and B

I said C again, but I'm not sure about B.

Answer 3

The picture applies to both questions.

Answer 4

@Vocaloid

Answer 5

@Narad

Answer 6

I don't need help with question 1, just 2.

Answer 7

Air pressure is highest in the lungs during which of the following points?

When lung volume is lowest.
When lung volume is highest.
When lung volume is constant.
When lung volume is changes.

I think it's A, but I'm not sure. I'm applying Boyle's law here