Here are three shorter differences and similarities between cobras and humans in their respiratory systems:

Differences:
1. Structure: Cobras have elongated lungs and a long trachea, while humans have more compact lungs and a shorter trachea.
2. Breathing method: Cobras are mouth breathers, while humans predominantly breathe through their nose.
3. Gas exchange efficiency: Cobras have a higher lung capacity and gas exchange rate compared to humans.

Similarities:
1. Basic anatomy: Both cobras and humans have a respiratory system consisting of a trachea, bronchi, and lungs.
2. Gas exchange function: The primary purpose of the respiratory system in both cobras and humans is to exchange oxygen for carbon dioxide.
3. Protective mechanisms: Cobras and humans have evolved protective mechanisms to prevent foreign objects from entering their respiratory system, such as the glottis in cobras and the epiglottis in humans.

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Differences:

1. Structure: Cobras have longer lungs and trachea, while humans have compact ones.
2. Breathing method: Cobras mouth breathe, while humans mainly use the nose.
3. Gas exchange efficiency: Cobras have higher capacity and rate than humans.

Similarities:
1. Basic anatomy: Both cobras and humans have trachea, bronchi, and lungs.
2. Gas exchange function: Both cobras and humans exchange oxygen for carbon dioxide.
3. Protective mechanisms: Cobras and humans have evolved mechanisms to prevent foreign objects from entering their respiratory system.

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Differences:

1. Structure: Cobras have longer lungs and trachea than humans.
2. Breathing method: Cobras mouth breathe, humans mostly nose breathe.
3. Gas exchange efficiency: Cobras have higher capacity and rate.

Similarities:
1. Basic anatomy: Cobras and humans have trachea, bronchi, and lungs.
2. Gas exchange function: Both exchange oxygen for carbon dioxide.
3. Protective mechanisms: Cobras and humans prevent foreign objects from entering respiratory system.