digestion and absorption

Question 1

lipid digestion

Answer 1

Micelles contain bile salts and fatty acids/monoglycerides;
Bring/release/carry fatty acids/monoglycerides to cell/lining (of the iluem)
Fatty acids/monoglycerides absorbed by diffusion;
Triglycerides (re)formed (in cells);
Vesicles move to cell membrane;

Question 2

adaptations of alveoli

Answer 2

• many alveoli –> large s.a
• thin alveolar wall –> short diff distance
• alveolar wall lines w liquid –> gases dissolve
• close to capillaries –> short diff distance

Question 3

breathing in

Answer 3

• external intercostal muscles contract + raise ribcage up and out
• diaphragm contracts
• volume increases causes pressure decrease
• lower than atmospheric pressure
• therefore air moves into the lungs down pressure grad.