Short Term Responses To Exercise Flashcards
What is the cardiac control centre ort of
The autonomic nervous system
What is the ANS made of
The sympathetic nervous system and the parasympathetic nervous system
What is heart rate regulated by
Neural control
Hormonal control and intrinsic control
What are chemoreceptors
Tiny structures in the carotid arteries and the aortic arch that detect changes in blood acidity
Where does the information from chemoreceptors go
Sent to the cardiac control centre in the medulla oblongata. As pH decreases heart rate increases
What are baroreceptors
A special stretch receptor in the walks of aorta and vena cava that detect changes in blood pressure
What happens when bp increases to barorecptoes
They increases heart rate
What are proprioceptors
Sensory nerve endings in the muscles tendons and joints that detect changes in body movement and position
Where does info from proprioceptors go
Send info to the brain that causes sympathetic nervous system to increase firing of SAN to increase heart rate
Where does info from thermal receptors go
To the CCC which then sends it to the heart via the accelerator nerve
The SAN then increases heart rate
What affect does adrenaline have on the heart
It increases the strength of ventricular contraction so stroke volume and increases heart rate
What happens when exercise stops
Acetylcholine is released which stimulates the parasympathetic nervous system and HR decreases
Sodium and potassium balance
An increase in the electrolyte balance in the cardiac muscles cause the SAN to increase heart rate
What is ventilation controlled by
The nervous system
How is minute ventilation controlled
By the respiratory control centre via the phrenic nerve
What monitors minute volume
Lung stretch receptors
What controls blood pressure
The vasomotor control centre
What information is used to redirect blood flow
Blood pressure and joint movement helps redirect blood flow to active muscles
What are some short term responses to exercise
Increased body temp
Increased heart rate
Increased BP
Increased venous return
Increased minute ventilation
