Concepts of Regulation Flashcards
Micturition Reflex
Process by which urine is removed from the bladder
Baroreflex Mechanism
If the BP increases, the heart rate goes down
BP = Cardia Output x Peripheral Resistance
Cardiac Output = SV x Heart Rate
Organs which exhibit good autoregulatory mechanism
Heart, kidneys, brain
Organs with poor autoregulatory mechanism
Skin
Baroreceptor Reflex
Increase BP
Stretched blood vessels (increase in perfusion pressure)
Receptors in the aortic arch sends signals to the central center (nucleus tractus solitarius)
NTS has 2 centers and sends excitatory fibers: caudal ventral lateral medulla and roster ventral lateral medulla
Send to organs (effector organs): heart and blood vessels
Inhibition of sympathetic
Activation of parasympathetic
Low HR
Low BP
No stretch in blood vessels
Continuous activation of sympathetic
Inhibition of parasympathetic
High HR
Routes of fluids in the body
Entry only through GI
4 exits Skin GI Kidney ...
There is osmotic balance between the ECF and ICF
Through osmosis
Movement of water from lower concentration to high concentration through aquaporins
Osmosis
What happens to a man in the Sahara
Dehydration, loss of body fluids
Increase in the concentration of solutes
Loss of water in ECF
Movement of water from ICF to ECF
Effective Circulating Volume
Volume in the vascular system
Actively perfused in the tissues
T or F
Only through the kidneys that se can regulate fluids in the body
True
Main determinant of ECF volume
Na+
Cl+
HCO3-
High pressure
Low pressure baroreceptors
Arterial side
Venous side (Right atrium)
Receptors in the atria
Increase return in the heart
Increase natriuresis
Inhibition of ADH
Increase salt, water in the kidney
Dehydration: decreased filling of atrium
No stretch
No atrial…stimulation
No increased diuresis
