7.Dive Physiology Flashcards
Peripheral chemoreceptors
Carotid body
Aortic bodies
Carotid bodies receive more :
blood flow than any other organ:
2000ml/100g of tissue.
In carotid bodies despite high metabolic rate (2-3 fold higher than brain), capillary PO2 and PCO2 is close to:
arterial values due to the high blood flow.
Type I cells of the carotid body
Sensitive to:
Prominent:
Closely associated with:
Sensitive to local changes in PO2, PCO2 and pH
Prominent cytoplasmic granules (such as ACh and DA)
Closely associated with both myelinated and unmyelinated afferent fibres
Type II cells
cell wraps around:
No:
May have ______ role
- cell wraps around the glomusand nerve endings
No cytoplasmic granules
neuromodulatory role
Afferent information from the peripheral chemoreceptors is sent via;
Carotid body
Aortic body
Stimulation of carotid bodies results in
Hyperventilation
Increased arterial pressure
Stimulation of carotid bodies results in what 4 responses
Respiratory response
cardiovascular responses
Neuroendrocine Responses
Renal Responses
________ arrest in most mammals causes great discomfort. There is a heightened effort to breathe followed by loss of _________and if delivery of oxygen continues to be absent, death will follow.
Respiratory
consciousness
In all diving vertebrates, diving is accompanied by ?
a bradycardia (decrease in heart rate
Arterial pressure during diving is usually ?
maintained or even elevated during the dive.
