Tag: gas exchange

$600-800$ million

$200-300$ million

$1-2$ million

$100,000-150,000$

Having spongy texture and proper shape

More surface area for diffusion of gases

More space for increasing volume of inspired air

More nerve suply

Trachea $\rightarrow$ lungs $\rightarrow$ larynx $\rightarrow$ pharynx $\rightarrow$ alveoli

Nose $\rightarrow$ larynx $\rightarrow$ pharynx $\rightarrow$ bronchus $\rightarrow$ alveoli $\rightarrow$ bronchioles

Nostrils $\rightarrow$ pharynx $\rightarrow$ larynx $\rightarrow$ trachea $\rightarrow$ bronchi $\rightarrow$ bronchioles $\rightarrow$ alveoli

Nose $\rightarrow$ mouth $\rightarrow$ lungs

Inefficient system of ventilation with little of residual air

Inefficient system of ventilation with high percentage of residual air

An efficient system of ventilation with no residual air

An efficient system of ventilation with little residuak air

Alveoli

Bronchus

Nostrils

Trachea

Fibrous cartilage

Calcified cartilage

Elastic cartilage

Hyaline cartilage

$pO _2$ is more in alveoli than in blood

$pO _2$ is more in blood than in tissues

$pCO _2$ is more in alveoli than in blood

$pCO _2$ is more in blood than in tissues

$1 < 2 < 3 < 4$

$1 < 4 < 3 < 2$

$1 < 3 < 2 < 4$

$1 < 4 < 2 < 3$

If volume of lung is increased, the pressure decreases proportionately

If volume of lung is increased, the pressure also increases proportionately

If volume of lungs is increased, the pressure decreases disproportionately

If volume of lungs is increased, the pressure remains the same

Right bronchus

Left bronchus

Secondary bronchiole

Respiratory bronchiole