How Do the Lungs Work?

What is one vital function that our body performs automatically?

• Breathing

• Walking

• Speaking

• Digestion

Which system controls the involuntary actions of breathing?

• Muscular system

• Endocrine system

• Autonomic nervous system

• Circulatory system

What happens when the diaphragm flattens?

• Blood pressure drops

• Heart rate increases

• The chest cavity enlarges

• The lungs contract

Tags

NGSS.HS-LS2-5

What structure directly receives air after it passes through the trachea?

• Capillaries

• Bronchi

• Diaphragm

• Alveoli

What is NOT a function of the bronchioles in the respiratory system?

• Exchanging gases

• Dividing into smaller tubes

• Producing mucus

• Transporting oxygen

What protein in red blood cells binds to oxygen?

• Keratin

• Myoglobin

• Collagen

• Hemoglobin

During gas exchange, what substance is expelled from the capillaries into the alveoli?

• Water vapor

• Nitrogen

• Oxygen

• Carbon dioxide

Tags

NGSS.HS-LS2-3

What triggers the release of carbon dioxide from the lungs?

• Contraction of the diaphragm

• Inhalation of oxygen

• Expansion of the alveoli

• Relaxation of the intercostal muscles

Approximately how many liters of air does an average adult breathe each day?

• 20000 liters

• 5000 liters

• 500 liters

• 10000 liters

Which part of the nervous system is responsible for the breathing process?

• Autonomic nervous system

• Somatic nervous system

• Peripheral nervous system

• Central nervous system