L18;C8 Flashcards
Capillary fluid movement in and out of the tissues have two types of pressure, what are they?
Hydrostatic pressure—> pressure exercised between Walls and blood flow
Osmotic pressure—> pressure exerted by proteins in the blood
What happens if there is significant plasma [] decrease?
Long duration exercise will be effected as well as core temperatures
How does an increase in MAP effect hydrostatic pressure?
It will increase hydrostatic pressure since there is more resistance in arteries and pressure
What happens to osmotic pressure when metabolic build up occurs?
This will increase the tissue osmotic pressure (since it deal with proteins and build up)
Activation of mechanoreceptors and chemoreceptors are caused by 2 factors:
- G3 and G4 afferent neurones
2. Efferent limbs in the sympathetic nerve to the heart and blood vessels
When we initiate exercise, we send what kind of signal to skeletal muscle?
Feedforward
Ventilation increases proportionally to metabolic needs of muscles, but
At low exercise intensity, only ________ volume increases
Where as
At high intensity, _______ and _______ volume increase
Tidal,
Ventilation, tidal
What are three factors that regulate ventilation recovery after exercise and delays it?
pH, PCO2, Temperature
True or false: ventilation rates reach a steady state but can also keep increasing
True
_____ O2 in breathing air will cause an _______ in ventilation rate.
Less, increase
_______ has been seen to blunt responses to chemoreceptors.
Hyperoxima
What are two types of breathing issues, describe them?
Dyspnea—> this is the shortness of breath, thsi is common in unfit and old people and blood levels wont be able to match with pH.
Hyperventilation—> this is an increase in PCo2 gradient between blood and alveoli. A decrease in blood PCo2 leads to an increase in blood pH which decreases the drive to breathe
Ventilation and O2 consumption are proportional until what percent of Vo2 max?
55-70%
Why does lactate acclamation occur? What does it cause and what is used to solve it?
It occurs when there is more produced than it can be cleared, this causes H+ ions to be present in the blood (effects pH level) which eventually can be taken by a HCO3 buffer and utilized.
What is the ventilatory threshold actually referring to?
This is referring to a disproportionate increase in Co2 produced per minute relative to O2 consumption
