AIPMT-PRELIMS Zoology Breathing and Exchange of Gases Class 11 Questions

Which one of the following is the correct statement for respiration in humans?

The ciliated columnar epithelial cells in humans are known to occur in

A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O₂

The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?

Listed below are four respiratory capacities (a - c) and four jumbled respiratory volumes of a normal human adult Respiratory capacities (a) Residual volume (b) Vital capacity (c) Inspiratory reserve volume (d) Inspiratory capacity Respiratory volumes 2500 mL 3500 mL 1200 mL 4500 mL Which one of the following is the correct matching of two capacities and volumes?

What is vital capacity of our lungs?

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude:

Which one of the following statements is incorrect?

The majority of carbon dioxide produced by our body cells is transported to the lungs:

Blood analysis of a patient reveals an unusually high quantity of carboxy-haemoglobin content. Which of the following conclusions is most likely to be correct ? The patient has been inhaling polluted air containing unusually high content of -

When CO₂ concentration in blood increases, breathing becomes -

Reason of lung cancer :-