Question

Identify the correct statements about human lungs.
(A). Each lung is enclosed in a double pleural membrane with a fluid filled cavity between them.
(B). The left lung is larger and divided into three lobes and the right lung is smaller and divided into two lobes.
(C). Each lung has a number of air sacs, each with 10-12 alveoli.
(D). There are about 700 million alveoli in the lungs.
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A), (B) and (C) only.
• C. (A), (B), (C) and (D).
• D. (A), (C) and (D) only.

Hint:

Check lobes, pleura, air sacs and total alveoli; the right lung is larger with three lobes.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept
Each statement about the lungs must be checked on its own.

Step 2: Check the statements
(A) is correct: each lung has a double pleural membrane with fluid between the layers.
(B) is wrong: the right lung is larger with three lobes and the left lung is smaller with two lobes.
(C) is correct: each air sac has about 10 to 12 alveoli.
(D) is correct: the lungs have about 700 million alveoli.

Step 3: Compare the options
The correct statements are (A), (C) and (D) only.

Final Answer:
Statements (A), (C) and (D) are correct. \[ \boxed{\text{(D) }\text{(A), (C) and (D) only.}} \]