Homeostasis

Question 1

What does the term prioritization mean in the context of homeostasis?

Answer 1

when our bodies are thrown off balance, they tend to compensate by prioritizing getting back towards balance
while this is happening other things may be sacrificed

Question 2

What is the sensor or “thermostat” mechanism that the body uses to detect acute changes in blood pressure?

Answer 2

baroreceptor - monitors blood pressure
located in carotid artery
baroreceptors activate the sympathetic nervous system in response to low Bp and activate the parasympathetic nervous system in response to high Bp

Question 3

How would you describe the sequence of physiological events that occur in response to a significant acute hemorrhage (loss of blood)?

Answer 3

loss of blood decreases blood pressure

when baroreceptors are activated, sympathetic nervous system turns on things like epinephrine, norepinephrine all increasing BP
heart pumps, blood vessels constrict

Question 4

What is the relationship between the mechanisms involved in restoration of blood pressure after acute blood loss and the Ohm’s Law analogy that you learned about in previous lessons?

Answer 4

OHMs law:
MAP - CVP = Q x SVR

MAP falling bc of bleeding
response of body is to increase Q (heart contracting- which increases cardiac output) and increase SVR by constricting blood vessels

all to restore MAP

Question 5

what is chemoreeptor?

Answer 5

chemoreceptors - we have them in brain (central) and carotid arteries (peripheral)

monitors ph and Co2 level in central
and O2 and co2/ph in peripheral
senses H+

• used in monitoring acid- base balance in body

Question 6

what receptors measure blood pressue to keep it in noraml range?

Answer 6

baroreceptos