regulation of heart rate during exercise Flashcards
what is an extrinsic factors
outside of the heart
name the neural factors
chemoreceptors, baroreceptors, proprioreceptors and thermo receptors
what do chemoreceptors do?
judge chemical change, in blood
>detect level of oxygen and carbon dioxide in blood
what do baroreceptors do?
judges whether the blood pressure levels change
what do proprio receptors do?
judge whether muscles are increasing in contraction rate
what do thermo receptors do?
judge temperature of whole body
What is the purpose of the different receptors?
these receptors send information to the vcc which in turn increases stimulation of SA node via the sympathetic nervous system in which in turn increases HR.
what does vcc stand for?
vasomotor control center
what is an intrinsic factor?
inside the heart
what are the hormonal factors that regulate the heart rate during exercise
- adrenaline released prior to exercise, which stimulates the sympathetic nervous system, which increases stimulation of SA node, which then increases HR.
- adrenaline also increases force of cardiac contractions, increasing SV and Q
What are the intrinsic factors that detect exercise is occurring
INCREASE TEMPERATURE
- causes increased speed of nerve transmission, which in turn increases stimulation of SA node, which increases heart rate
INCREASED VR
- increase volume of blood returning, stretches the wall of the heart, which increase stimulation of SA node, which in turn increases HR
regulation of heart during recovery
INTRINSIC FACTORS
- decrease in temperature decreases speed of nerve transmissions. VR slows down
NEURAL FACTORS
- receptors detect changes the other way. messages sent to VCC, use of parasympathetic nervous system to slow stimulation of SA node
HORMONAL FACTORS
- adrenaline release slows which decrease stimulation of SA node, slowing HR
