Physiology 5 - Feedback control in CV system Flashcards
What detects deviations in the MAP?
Baroreceptors
Where is the cardiovascular control system?
Medulla
What are the effectors of MAP?
HeartBlood vessels
What changes can the heart make that results in a change in the MAP? (2)
Heart rateStroke volume
What change can the blood vessels make that results in a change in MAP?
Total peripheral resistance
What type of feedback system is the control of blood pressure/
Negative
What is blood pressure?
The outward hydrostatic pressure exerted by the blood on blood vessel walls
What is the systemic blood pressure?
The pressure exerted by the blood on the walls of the aorta and systemic arteries when the heart contracts (normally less than 140mmHg)
What is the systemic diastolic pressure?
The pressure exerted by the blood on the walls of the aorta and systemic arteries when the heart relaxes (normally less than 90mmHg)
What is mean arterial blood pressure?
The average arterial blood pressure during a single cardiac cycle, which involves contraction and relaxation of the heart
Equations for MAP? (3)
Map = [(2 X Diastolic) = systolic] / 3MAP = DBP + 1/3 difference between SBP and DBPMAP = CO x TPRMAP = SV X HR X TPR
what is the pulse pressure?
The difference between SBP and DBP
What is the normal arterial blood pressure?
Less than 140 systolicLess than 90 diastolic
What is the normal range of mean arterial blood pressure?
75 - 105mmHg
What MAP is need, at least, to perfuse the coronary arteries, brain and kidneys?
At least 60mmHg