Mechanics of Breathing & Interpretation of Spirometer trace

If pressure in the thoracic cavity increases, what has happened to the volume of the thoracic cavity?

• increased
• decreased
• stays the same

If pressure in the thoracic cavity decreases, what has happened to the volume of the thoracic cavity?

• increased

• decreased

• stays the same

What helps to increase the volume of the thoracic cavity?

• ribs move up and out & diaphragm contracts and flattens
• ribs move down and in & diaphragm relaxes
• ribs move up and out & diaphragm relaxes

Which muscles contract to help with inspiration at rest?

• pectorals

• intercostal muscles

• sternocleidomastoid

Which additional muscles contract during inspiration during exercise?

• ribs

• sternocleidomastoid

• abdominal muscles

• pectorals

Which muscles contract to help with expiration during exercise?

• abdominal muscles

• intercostal muscles

• pectorals

• sternocleidomastoid

What muscles are used in breathing in and breathing out?

• diaphragm and intercostals
• diaphragm and lungs
• lungs and ribs
• lungs and diaphragm

An 18 year old will breathe around how many breathes per minute

• 20

• 5

• 12

• 19

What is the volume of one breath called?

• minute ventilation
• inspiratory capacity
• tidal volume
• vital capacity

What is the amount of air that can be forcibly inhaled after a normal inhalation?

• Minute Volume

• Expiratory System

• Tidal Volume

• Inspiratory Reserve Volume