Kinesiology 3339A/B Lecture 18: Kin 3339 Lecture 18
Lecture 18!
Kinesiology 3339: Exercise Nutrition !
Fats Part 5
Fat as Energy Source (Breakdown)
•As the chylomicron is passing through the blood and passing specifically a fat cell (target cell), the fat
cell has receptors that recognizes the chylomicron apoproteins and causes it to break down
•Chylomicron components released into the vascular system
•FFA
-Released FFA are not soluble and instead attached to protein in the blood called albumin travel
within the vascular system to other tissues
-The FFA becomes available to muscle/adipose cell downstream and can be absorbed
into cell through process that involves carnitine
-The FFA can be transported into mitochondria where aerobic activity occurs to be used
for energy ATP production
-But can also be stored as muscle triglyceride as a small amount
-FFA in muscle will increase with training, FFA in adipose will decrease with training
-With training it is easier for fat to be activated by breaking down muscle triglyceride,
harder to breakdown fat cell far away (needs to be transported in blood)
•Glycerol
•The glycerol is not taken up by the muscle, it stays in the blood until it is taken up by the liver
and is reconverted into glucose by gluconeogenesis then released into the blood as glucose
•Or is stored in the liver for future use - all of the energy is retained
Mobilization and Circulation of FFA
•With exercise many hormones released like epinephrine, cortisol released adrenal gland that flood the
vascular system
-Hormone Sensitive Lipase break triglyceride into 3 fatty acids and glycerol
-Then they are released into blood, where FFA readily attached to albumin and are transported
through the blood
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