Mechanisms of Breathing (1)

Breathing mechanisms of insects; inhalation

During inhalation, the abdominal muscles relax; the air pressure inside the trachea decreases which allows air from outside to enter the trachea through the spiracle

Breathing mechanism of insects; exhalation

The abdominal muscles will contract when air is exhaled. This increases the air pressure in the trachea which forces the air to flow out of the spiracle

Breathing mechanism of frog; inhalation

Breathe through the nostrils, mouth, glottis closed; the floor oral cavity lowered; air enters the oral cavity. Glottis open; nostrils closed, the floor oral cavity raised; pushing air into the lungs

Breathing mechanism of frog; exhalation

The lungs contract, the air is expelled from the lungs. Air is also expelled through the nostrils while the rest is mixed with the air in the oral cavity

Breathing mechanism of fish; inhalation

The mouth opens, the floor buccal cavity is lowered, the operculum cavity enlarges, the operculum opening is closed; reduce the pressure in the buccal cavity; draws water into the mouth

Breathing mechanism of fish; exhalation

Mouth closed, floor buccal cavity rises; water enters lamellae; gas exchange occurs; the wall of the operculum contracts; reduce volume; increase the pressure of the oral cavity; push the water out

Condition of intercostal muscles of humans during inhalation

The external intercostal muscles contract and the internal intercostal muscles relax which causes the rib cage to move upwards and outwards

Condition of diaphragm of humans during inhalation

The diaphragm muscles contract makes the diaphragm move downwards and become flat

Condition of intercostal muscles of humans during exhalation

The external intercostal muscles relax and the internal intercostal muscles contract that cause the ribcage to move downwards and inwards

Condition of diaphragm of humans during exhalation

Diaphragm muscles contract causing the diaphragm to move upwards and become dome

Biology

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Mechanisms of Breathing (1)

Mechanisms of Breathing (1)