Inhalation mechanism of humans

The breathing mechanism does not involves changes in the volume and preassure in the repiratory cavity.

• True

• Not sure

• False

Which two structures does the trachea lead to in the lungs?

• The bronchi

• The pleural membranes

• The bronchioles

What are the tiny air sacs in the lungs called?

• Bronchioles

• Capillaries

• Alveoli

When we inhale (breathe in), what happens to the pressure in the thorax cavity?

• It increases

• It stays the same

• It decreases

What happens when we inhale (breathe in)?

• The external intercostal muscles contract and the ribcage is pulled upwards and inwards

• The external intercostal muscles contract and the ribcage is pulled upwards and outwards

• The internal intercostal muscles contract and the ribcage is pulled upwards and outwards

Which of these is an adaptation for efficient gas exchange in the air sacs (alveoli)?

• Thick walls

• Few blood capillaries

• Moist surface

During exercise, what happens to breathing in humans?

• The depth of breathing increases and the breathing rate increases

• The depth of breathing increases but not the breathing rate

• The breathing rate increases but not the depth of breathing