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20
What is the amount of $0_2$ supplied to tissues through every 100 mL of oxygenated blood under normal physiological conditions?
Explanation
Every 100 mL of oxygenated blood can deliver around 5 mL of $\mathrm{O}_2$ to the tissue under normal physiological conditions.
21
A major percentage $(97 \%)$ of $O_2$ is transported by RBCs in the blood. How does the remaining percentage ( $3 \%$ ) of $\mathrm{O}_2$ transported?
Explanation
About $97 \%$ of $\mathrm{O}_2$ is transported by RBCs in the blood. The remaining $3 \%$ of $\mathrm{O}_2$ is carried in a dissolved state through the plasma.
22

Arrange the following terms based on their volumes in an ascending order.

(a) Tidal Volume (TV)

(b) Residual Volume (RV)

(c) Inspiratory Reserve Volume (IRV)

(d) Expiratory Capacity (EC)

Explanation

(d) Expiratory Capacity (EC) Approximate volume is 1000 mL .

(b) Residual Volume (RV) Approximate volume is 1200 mL .

(c) Inspiratory Reserve Volume (IRV) Approximate volume is 2500 to 3000 mL .

(a) Tidal Volume(TV) Approximate volume is 6000 to 8000 mL .

23

Complete the missing terms

(a) Inspiratory Capacity (IC) $=\ldots+$ IRV

(b) $\ldots=\mathrm{TV}+\mathrm{ERV}$

(c) Functional Residual Capacity $(F R C)=E R V+\ldots$

Explanation

(a) Inspiratory Capacity $(\mathrm{IC})=(\mathrm{TV})+(\mathrm{IRV})$ Tidal Volume. Inspiratory Reserve Volume

(b) Expiratory Capacity $(\mathrm{EC})=(\mathrm{TV}+\mathrm{ERV})$ Tidal Volume. Expiratory Reserve Volume

(c) Functional Residual Capacity $(F R C)=(E R V)$ Expiratory $+(R V)$ Reserve Volume. Residual Volume

24

Name the organs of respiration in the following organisms.

(a) Flatworm .............

(b) Birds ............

(c) Frog ............

(d) Cockroach $\qquad$

Explanation

(a) Flatworm General body surface

(b) Birds Lungs

(c) Frog Lungs and moist skin

(d) Cockroach Tracheal tubes

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