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During inspiration, the alveolar pressure is less than the atmospheric pressure. This causes air to flow into the alveoli. The external intercostal muscles and diaphragm contract during this phase.

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βˆ™ 10y ago
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βˆ™ 11y ago

When you inhale, your lungs expand, like a balloon. This is effected by the simultaneous expanding of the chest via the intercostal muscles of the rib cage (pulling the lungs out and up) and the contraction of the diaphragm (pulling the lungs down).

A balloon, if expanded in the tub, would fill up with water. Likewise your lungs fill up with air when expanded.

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βˆ™ 8y ago

Air is moved by the use of the breathing muscles: the scalenes (elevate rib cage), sternocleidomastoids (elevate rib cage), pectoralis minors (elevate rib cage), external Intercostals (elevate rib cage), internal Intercostals (depress) and the diaphragm (prime mover of inhalation)
When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity.
The intercostal muscles between the ribs also relax to reduce the space in the chest cavity. The opposite happens when you breathe in.
Rather more complicate than you think.

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βˆ™ 12y ago

the gas pressure in the lungs is less than the atmospheric pressure.

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βˆ™ 13y ago

the rib muscles and diaphragm contract, increasing the lung volume.

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Q: Why does air enter the lungs upon inhalation?
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Related questions

What are similarities and differences between inhalation and exhalation?

Both inhalation and exhalation are part of the respiratory process where air is exchanged in the lungs. During inhalation, the diaphragm and intercostal muscles contract to expand the chest cavity, allowing air to enter the lungs. During exhalation, these muscles relax, and the chest cavity decreases in size, forcing air out of the lungs. The key difference is the direction of airflow: inhalation is the process of taking air into the lungs, while exhalation is the process of expelling air from the lungs.


The Taking in of air is called?

The process of taking in air is called inhalation. During inhalation, the diaphragm and rib muscles contract to expand the chest cavity, allowing air to enter the lungs.


What is the movement of air in and out of lungs called?

Inhalation and exhalation


What movement of air in and out of the lungs is called?

Inhalation and exhalation


What is the movement of air on and out the lungs?

The movement of air on and out the lungs is called respiration. The movement of air into the lungs is called inhalation (inspiration). The movement of air out of the lungs is called exhalation (expiration).


How many phases in one breath?

There are two phases in one breath: inhalation and exhalation. During inhalation, air is drawn into the lungs, and during exhalation, air is expelled from the lungs.


What happens when pressure is lower inside the lungs than outside the lungs?

When pressure inside the lungs is lower than outside, air flows into the lungs to equalize the pressure. This is known as inhalation, where the diaphragm contracts and the rib cage expands to create more space for air to enter the lungs.


What is act of taking in air as the diaphragm contract and pulls downward called?

The act of taking in air as the diaphragm contracts and moves downward is called inhalation. During inhalation, the chest cavity expands, creating a vacuum that draws air into the lungs. This process allows for oxygen to enter the body and be distributed to the cells for respiration.


Is artificial respiration the same as inhalation?

inhalation is the taking in of air to the lungsartificial respiration is a method of forcing air in and out of the lungs when the body is not able to do this itself


What is the name of the rib muscles that contribute to breathing?

Ribs are bones, but lungs contribute to breathing and they are a muscle organNo, your Lungs ARE NOT A MUSCLE. Your diaphragm is the main muscle in inhalation, which opens your lungs (works by creating a negative pressure in your lungs i.e. the pressure outside your chest cavity is more than the pressure in your lungs, causing air to enter your lungs).However, during forced inhalation and exhalation your intercostal muscles and rectus abdominus muslces play a part in exhalation (forcing air out). scalenes lift up your rib cage to allow maximum inhalation.


Under what internal condition does air flow into the lungs?

Inhalation. Breathing.


When air moves into the lungs when the diaphragm muscles do what?

The diaphragm moves down to make the lungs expand (inhalation)