Mairead - Neural and Hormonal Control of Vasculature Flashcards
What is the goal of the CVS regulation?
To ensure blood flow changes occur:
- at an appropriate time
- in the right area
- without drastically affecting blood flow to vital organs
What factors are involved in the regulation of CVS function
Local factors
Neural factors
Hormonal factors
Write about how local factors are involved in the regulation of CVS function
(4)
Result in a change in blood flow pattern in
response to a change in metabolism.
Called autoregulation.
Provides an immediate and localised
adjustment in perfusion
If this fails, neural factors work
What is autoregulation
A change in blood flow pattern in response to a change in metabolism
What does autoregulation do
Provides an immediate and localised adjustment in perfusion
When do neural factors work
If local factors fail
Write about how neural factors are involved in the regulation of CVS function
(4)
They result in a change in blood flow between
regions of the body.
Neural factors change blood flow in response to changes in blood pressure and blood
gases.
This is mediated by an ANS change.
ANS output changes Cardiac Output and
Peripheral Resistance
What affect do neural factors have
They change blood flow between regions of the body
Neural factors change blood flow in response to what
Response to changes in blood pressure and blood gases
What is responsible for changing blood pressure and blood gases
This is mediated by an ANS change
ANS affects what values
Cardiac Output and Peripheral Resistance
Write about how hormones are involved in the regulation of CVS function
(6)
Enhance the short term response and
Direct the long term response.
Affect cardiac output and peripheral resistance and in the longer term regulate blood volume and blood composition.
In addition to barororeceptors and chemoreceptors…
Volume change detected as pressure and osmolarity (osmoreceptors) in renal tissue and
hypothalamus.
Gas disturbance (O2) detected in renal tissue
What do hormones do in general
Enhance the short term response of ANS
Direct a long term response
What do hormones affect in the CVS
(4)
Cardiac output
Peripheral resistance
Blood volume
Blood composition
What exactly is stress
Increased physical demand
What will bring on stress
(5)
Exercise
Fever
Haemorrhage and dehydration
Tumour growth
Psychological stress
What is the demand and or change in exercise?
ih i
What is the short term response to exercise?
bo
What is the long term response to exercise?
bob
What is the demand and or change to tumours
bo
What is the long term response to tumours
bou
What is the blood change/response to haemorrhage/dehydration
bo
What is the short term response (nervous) to haemorrhae/dehydration
buo
What is the long term response to haemorrhage/dehydration
bio