Module 1 Flashcards
Introduction and Recap
What is the term for exercise where oxygen demand is being met by oxygen supply?
Steady state exercise
What is a control system?
Processes that help maintain/regulate systemic homeostasis
What are the 3 major components of Control systems?
Receptors, Control centre and Effectors
What is a stimulus?
Change occurring in internal environment
What is the response in control systems?
The change is corrected
What is homeostasis?
Maintenance of static or constant conditions in the internal environment
Examples of homeostasis in the human body
Blood pressure regulation, thermoregulation (body temp), acid-base balance (pH), glucose regulation, osmoregulation (fluid volume)
What things in the body change with exercise?
O2 consumption
O2 delivery
body temp
blood pressure
metabolic end products
release of CO2
What happens to VO2 as exercise increases?
VO2 increases with exercise as our exercising muscles require more O2
Q (cardiac output) is the product of what?
Heart rate and stroke volume
What is Q (cardiac output) at rest?
5L
What is Q during exercise?
25-40L
What is the relationship between Q and VO2 consumption
linear - about 6L cardiac output increase from 1L VO2 increase
what physiological system is responsible for controlling the HR?
autonomic nervous system
sympathetic and parasympathetic
What is intrinsic rate?
100-110 bpm
how many mL of O2 per 100mL blood in arteries at rest?
20mL
How many mL of O2 extracted for muscles and how many back to the heart through veins? (at rest)
4-5mL from 100mL of blood extracted for muscles, 15-16mL back to heart
a-vO2 diff at rest?
4-5mL O2 per 100mL of blood
a-v O2 diff during exercise?
15mL O2 per 100mL of blood
Ventilation increase from rest to exercise?
6L/min - >150L/min
Why does ventilation increase so much during exercise?
Because of changes in breathing rate and tidal volume
