Lecture 11
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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Organisms thicker than 2mm require what in terms of respiration?
a circulatory system to get respiratory products deeper into tissues.
3 requirements for respiratory surface
High Surface Area • Moist membranes • Surface must come into contact with the air or water.
Blood absorbs more oxygen if water flow goes with or against the blood flow
against
Early lungs were probably:
sacks that filled with air to allow floating or sinking easier
gas exchange in humans:
you breath in and air goes into alvoli through alveolar duct and makes contact with respiratory surface which is close to blood flow. O2 diffuses in, CO2 diffuses out
When diaphragm contracts, it pulls itself ____, increasing/decreasing thoracic volume
lower increasing
When diaphragm relaxs, it pulls itself ____, increasing/decreasing thoracic volume
back to its normal shape decreasing
during inhalation the diaphragm contracts/relaxes
contracts
during exhalation diaphragm contracts/relaxes
relaxes
3 main components of the circulatory system
• Heart to pump blood • Vascular system to transport blood • blood to carry O2
Arteries:
move blood away from heart
Arteries/veins have thicker walls
arteries
Veins:
move blood towards the heart
Order of flow:
Artery->Arteriole->Capillary->Venule->Vein
Veins have ___ that prevent ____
flaps backflow
PO2 in lungs is higher in ___ than ____
air blood
PO2 in oxygenated blood is higher than in tissues
so it moves to tissues (absorb)
Each hemoglobin contains _ hemes meaning it can carry _ O2
4 4
CO2 is transported as _____
bicarbonate