The Mechanics Of Breathing Flashcards

1
Q

What is the primary principle governing the movement of air during breathing?

A

Air moves from high pressure to low pressure via diffusion.

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2
Q

What pressure condition is necessary for inspiration to occur?

A

Pressure in the lungs must be lower than in the atmosphere.

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3
Q

What pressure condition is necessary for expiration to occur?

A

Pressure in the lungs must be higher than in the atmosphere.

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4
Q

How does increasing the volume of the thoracic cavity affect lung pressure?

A

It reduces the pressure of air in the lungs.

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5
Q

How does decreasing the volume of the thoracic cavity affect lung pressure?

A

It increases the pressure of air in the lungs.

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6
Q

What causes the pressure changes in the lungs during breathing?

A

The contraction of muscles.

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7
Q

Name the muscles used for inspiration during rest.

A
  • Diaphragm
  • External intercostals
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8
Q

Name additional muscles used for inspiration during exercise.

A
  • Sternocleidomastoid
  • Scalenes
  • Pectoralis minor
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9
Q

What muscles are involved in passive expiration at rest?

A

Diaphragm and external intercostals just relax.

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10
Q

Name the muscles used during active expiration.

A
  • Internal intercostals
  • Abdominals
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11
Q

Fill in the blank: To inhale, the diaphragm _______.

A

[contracts and is pulled flat]

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12
Q

Fill in the blank: During exhalation, the diaphragm _______.

A

[relaxes and rises to dome-shaped position]

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13
Q

True or False: The ribcage moves upwards and outwards during inhalation.

A

True.

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14
Q

True or False: The ribcage falls during inhalation.

A

False.

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