Biology Air

What is the approximate percentage of oxygen in expired air?

• 0.04%

• 4%

• 16%

• 21%

What helps oxygen to be absorbed rapidly into the blood in the lungs?

• Air breathed in has less oxygen than air breathed out.

• Alveoli have thick walls and a large surface area.

• Alveoli have thin walls and a large surface area.

• The concentration of oxygen in the blood is higher than in the alveoli.

The diagram shows some structures in the human neck and thorax. The lining of tube Q has cilia. What is an important function of the cilia?

• to help in the exchange of gases

• to increase the internal surface area of tube Q

• to moisten the air entering and leaving the lungs

• to move mucus towards the throat

What is the path of carbon dioxide as it leaves the lungs?

• alveolus → bronchiole → bronchus → trachea

• alveolus → bronchus → bronchiole → trachea

• trachea → bronchiole → bronchus → alveolus

• trachea → bronchus → bronchiole → alveolus

What are the products of aerobic respiration?

• Carbon dioxide and water

• Lactic acid

• Oxygen and glucose

• methane

Tags

NGSS.MS-LS1-2

Where does respiration happen in the cell?

• ribosomes

• Cell membrane

• Mitochondria

• Nucleus

During inhalation, which is true?

• The diaphragm curves and moves upwards

• The thoracic cavity becomes smaller

• Air pressure in the lungs increase

• The rib cage moves down

During normal human respiration, glucose reacts with ___________ to produce energy.

• nitrogen

• oxygen

• blood

• water

Tags

NGSS.MS-LS1-7

The energy you get during respiration is needed for what three things?

• growth, new cells, air

• growth, repair, movement

• new cells and movement

• breathing and moving

Tags

NGSS.MS-LS1-7

What happens to your breathing rate when you exercise?

• stays the same

• increases

• decreases