BREATHING AND EXCHANGE OF GASES
c. TV=500 ml
d. ERV= 3000 ml
1. Observe the diagram and answer the following question: (2)
a. Name the biological process involved in the gas exchange shown in the figure. (½)
b. How the oxygen is transported to cells from the alveoli? (1½)
1. Blood transports CO2 from tissues to lungs by various means. Mention any two methods of the same. (2)
a. What is represented by the above graph?
b. Write any three factors which can influence the sigmoid curve of this graph. (½ +1½= 2)
1. Asthma and emphysema are two disorders of the human respiratory system. Mention their causes and symptoms. (2)
1. Correct the following misconceptions of a student regarding human respiration.
a. Vital capacity includes tidal volume, residual volume and dead air.
b. Respiration is controlled by nerve centres located in hypothalamus and cerebrum. (2)