Air containing O₂ is inhaled into the _________
Alveoli
O₂ diffuses from alveoli into __________ capillaries.
Pulmonary
Blood transports O₂ to __________ capillaries.
Systemic
O₂ diffuses from systemic capillaries into __________ cells.
Systemic
CO₂ diffuses from systemic cells into __________ capillaries.
Systemic
CO₂ is transported in blood to __________ capillaries in the lungs.
Pulmonary
CO₂ diffuses from pulmonary capillaries into the __________.
Alveoli
Air containing CO₂ is __________ into the atmosphere.
exhaled
During quiet breathing, inspiration involves the __________ and __________.
Diaphragm, external intercostals
The diaphragm moves __________ when it contracts.
Inferiorly
The diaphragm is controlled by the __________ nerve.
phrenic
External intercostals __________ the ribs.
elevate
External intercostals are controlled by __________ nerves.
Intercostal
During forced inspiration, the rib cage moves __________, __________, and __________.
Superiorly, laterally, anteriorly
Forced inspiration further increases the __________ of the thoracic cavity.
Volume
During forced expiration, the rib cage is pulled __________, __________, and __________.
Inferiorly, medially, posteriorly
Forced expiration may also __________ abdominal contents.
compress
The __________ intercostals are active during forced expiration.
internal
__________ muscles help push air out by compressing the abdomen.
Abdominal
The thoracic cavity __________ in volume during inspiration.
Increases
The diaphragm __________ and __________ during inspiration.
Contacts and flattens
External intercostals lift the ribs __________ and __________.
Up and out
During forced inspiration, volume_______ even further
if accessory muscles of inspiration _____
increases ; contract
The thoracic cavity __________ in volume during expiration.
Decreases
