Gas Exchange

Which two structures lead from the trachea into the lungs?

• The bronchi

• The bronchioles

• The pleural membranes

What are the tiny air sacs in the lungs called?

• Capillaries

• Bronchioles

• Alveoli

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

• It increases

• It stays the same

• It decreases

What happens when we exhale (breathe out)?

• The diaphragm contracts and moves upwards

• The diaphragm relaxes and moves upwards

• The diaphragm relaxes and moves downwards

Which statement about atmospheric and exhaled air is correct?

• Oxygen passes into the blood and carbon dioxide passes out of the blood

• Oxygen passes out of the blood and carbon dioxide passes into the blood

• Oxygen and carbon dioxide pass into the blood

Tags

NGSS.HS-LS1-7

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

Tags

NGSS.HS-LS2-5

During exercise, what happens to breathing in humans?

• The depth of breathing increases and the breathing rate increases

• The depth of breathing increases and the breathing rate decreases

• The depth of breathing increases but not the breathing rate

Tags

NGSS.HS-LS1-3

Tobacco smoke contains carbon monoxide. What problem does this cause?

• The carbon monoxide irritates the airways, causing bronchitis

• The carbon monoxide combines with haemoglobin in the red cells, reducing the ability of the blood to carry oxygen

• The carbon monoxide causes lung cancer

During exercise working muscles need more:

• Carbon dioxide

• water

• oxygen

Tags

NGSS.HS-LS1-7