If a person stays on Mount Everest for some days,what will happen to their red blood cells (RBCs)?

Assertion $(A):$ $A$ person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations.
Reason $(R):$ Due to low atmospheric pressure at high altitude,the body does not get sufficient oxygen.
In the light of the above statements,choose the correct answer from the options given below.

Describe the disorders or deficiencies occurring due to disorders of the respiratory system.

Adenoids are the lymphoid tissues in which:

Which of the following respiratory disorders is commonly observed in workers employed in industries involving grinding or stone-breaking?

In pneumonia, where does the fluid accumulate?