EXERCISE PHYSIOLOGY UNIT 1 Flashcards
Homeostasis
Maintenance of a constant and internal environment. Many different systems are providing a comfortable state conscious.
Examples of homeostasis
Blood pressure
Body temperature
Heart rate
Blood glucose regulation
ion regulation
osmoregulation
Steady state
What happens at activity
Changes and comes back
Example: heart rate at sub maximal exercise// body core temperature during prolonged submaximal exercise
cross sectional area
Where majority of circulation is (capillaries)
Laminar flow
The flow is slow where there is friction (vessel wall) and fast where do is no friction (blood vessell)
Intercellular control system functions
Protein breakdown and synthesis
Adapt to current energy, the activity you do, (input and output)
Produces ATP
Maintenance of stored nutrients
Organ systems function
replenish oxygen and removes carbon dioxide
biological control system
Series of interconnected components that maintain a physical or chemical parameter at a near constant value
Happens in the brain
Failure of biological control system can result in diseases like type 1 diabetes
Components of biological control system
Sensor, receptor, control system, effector
What is the function of sensor and receptor
detects changes in variables
what is the function of the control system
Assesses input and initiates response
Effector
Changes internal environment back to normal
Example: Not breathing enough may result in urination.
Brings us back to homeostasis
Negative feedback
An effect to get the initial disturbance back to normal
Most control systems work in negative feedback
Positive feedback
Biological response increases the initial disturbance
Most control systems do not work in positive feedback
Helps system survive disturbance until something tells it to stop
Examples: Blood clotting,
How does exercise disrupt homeostasis
By changing body’s PH, PO2, pco2
Hormesis
Low to moderate stress results in a beneficial adaptive response on cells and organ system
Intracrine signaling
Chemical messenger inside cells trigger a response
Juxtacrine signaling
Chemical messenger passed between two cells
Autocrine signaling
Chemical messenger acts on that same cell
paracrine signaling
Chemical messenger acts on nearby cells
Endocrine signaling
Chemical messengers releases into the blood
Cell signaling
Affects cells with specific receptor to hormones .