Co-ordinated responses Flashcards
What is role of fight or flight response
To increase heart rate to pump more oxygenated blood
What happens to body when autonomic nervous system change from parasympathetic to sympathetic
Heart rate up
Dilate pupil
Blood glucose rise
Smooth muscle relax - wide air ways
What does CRF hormone do
Cause pituitary to release ACTH
Where is CRF released from
Hypothalamus
What does ACTH do
cause adrenal cortex to release adrenaline and noradrenaline
What is secondary messenger model
When hormone receptor complex cause enzyme to convert ATP to cyclic AMP which activates other enzymes
What type of reaction does adrenaline cause
Cascade
What does adrenaline cause
Adrenaline bind to liver cells
Activate adenyl cyclase
Trigger ATP to cyclic AMP
increase in cAMP activate protein kinases which activate more enzymes
Enzymes turn glycogen to glucose
What is the flight and fight an interaction
Neuronal and hormonal response
What is heart rate controlled by
The automatic nervous system - medulla oblongata which links to sino atrial node
Where is an impulse sent to increase heart rate
SNS and accelerator nuerone
Where is an impulse sent to decrease heart rate
Through peripheral nervous system and vagus nerve
What is a baroreceptor
Detects pressure in blood vessels
Aorta
Vena Cava
cartoid artery
What is chemoreceptors
detect change in chemicals like CO2
In medulla
Aorta
Cartoid artery
If there is low CO2 what happens to pH
pH rises
