Chp 19 Flashcards
Where can most of the oxygen in the blood be found?
bound to hemoglobin
Which structure connects directly to alveoli, where gas exchange will occur?
bronchioles
During exhalation, when the diaphragm relaxes and the volume of the chest cavity decreases, how is the air pressure inside the lungs affected?
It increases.
What does bright red blood indicate?
that oxygen is bound to hemoglobin
Which structures return blood to the heart?
veins
Which best describes an artery?
Arteries carry blood away from the heart.
which structures have valves to prevent blood from flowing backward?
veins
What is the purpose of the platelets, an important cell type within human blood?
They help form a clot at the site of a wound.
What is the physiological cause of a heart attack?
a blood clot lodging in a blood vessel supplying the heart
In the alveoli and lung capillaries, how are carbon dioxide and oxygen exchanged?
by diffusion
