Flashcards in Biopac Lesson 15 Deck (18)
Exercise is really just an increase in the ____ ________ rate caused by an increase in ________ activity
Exercise is _____; there is a progression of events that occur sequentially in response to the desire to increase the metabolism
The first phase of exercise is called what? Where does it come from? How does it spread?
Comes from cerebral cortex (usually frontal lobe) and spreads via thalamus to the sympathetic nervous system
Muscles need energy. Where does the energy from everyday living and light exercise come from?
When the muscles demand more energy, the energy source changes from fatty acids to what?
Where does the carbohydrate needed for strenuous exercise come from?
Glycogen stored in muscles, liver, blood glucose
The energy needed for contraction comes via the ______ initially
As muscle demand increase, enzymes of the Krebs cycle become saturated. What does this cause?
Increase of pyruvic acid, the end product of glycolysis
Pyruvate is then converted to lactic acid
1) The anticipatory phase _______ heart rate & blood pressure by the release of _________.
2) Shift from fatty acid metabolism to carb metabolism and resulting lactic acid increase stimulates medullary respiratory centers to increase ______. The drop in pH also causes ________ to muscles producing the most lactic acids. This causes _______ blood flow to those areas, and increased oxygen. The increased oxygen:
Helps but does not stop the buildup of lactic acid and pyruvate
3) The increase in blood flow to the muscles causes an ______ in venous return, which activates the ______ reception in the heart/aorta/carotid arteries, and ______ heart rate (and therefore blood pressure.
4) The lactic/pyruvate build-up plus an increase in ____________, affect the respiratory centers in the pons and medulla causing an _____ in breathing rate
Plasma CO2 levels
5) B/c muscles are only ____% efficient, most of the ATP breakdown is given off as _____, which then activates the hypothalamic brain centers to start ________ mechanisms such as:
Sweating, dilating blood vessels close to outer surface
The most prolonged mechanism to return to normal is the __________ and _________.
Removal of lactic acid
As you exercise, your body temperature:
As you stop exercising, your temperature:
Returns to normal
What causes the change in temperature?
Your blood is re-routed to your legs and away from the finger probe.