Flashcards in Chapter 6 - the heart and lungs at work Deck (78)
alveoli are clustered in bunches like grapes, wit a common opening into an alveolar duct called an ___________
the muscles surrounding the thoracic cavity which result in size change include?
Diaphragm, external intercostal muscles (expiration) and internal intercostal muscles (inspiration)
what happens when the diaphragm contracts
it allows blood to get into the lower extremities
what effect does doing exercises that work where diaphragm goes down?
improves efficiency of the heart and lungs
increase in heart size is one of the benefits that may arise as a result of endurance training
what do a larger atria and ventricles allow for?
allow for a greater volume of blood to be pumped each time the heart beats
what does the increased thickness of the walls of the heart (cardiac muscle) allow for?
allow for increased contractility (rate of contraction)
collecting chambers of the heart
increased capillarization is another benefit that may arise as a result of endurance training
increased capillarization allows for:
1) a greater surface area and reduced distance between the blood and the surrounding tissues
2) increasing diffusion capacity of oxygen and carbon dioxide
3) easing transport of nutrients to cells
increase in total blood volume along with the number and total volume of red blood cells
how is the increase in total blood volume along with the number and total volume of red blood cells done?
through stimulation of erythropoiesis in the bone marrow
formation of new red blood cells
why does ventilation increase with exercise?
in order to meet the increased demand of gas exchange
during exercise, ventilation can increase from 6L/minute at rest to over ___L/minute during maximal exercise and to more than 200L/minute during maximal voluntary breathing
true or false: with exercise/endurance, the lungs become more inefficient in gas exchange
false: with exercise/endurance, the lungs become more efficient in gas exchange
similar to ventilation in that the increased air flow allows for more gas exchange