C3.1 (3) Feedback Control

drop in pH causes…

nerve signals to be passed to muscles controlling breathing - diaphragm and intercostal muscles

why changes in ventilation rate during exercise are example of negative feedback

as soon as the blood pH returns to normal homeostatic level (7.35-7.45), the breathing rate decreases to normal

normal blood pH

7.35 - 7.45

spirometry is used to

mesure ventilation rate and tidal volume during excercise

during excercise the nreathes are both…

deeper and more frequent

peristalsis in the digest system is controlled by

central nervous system and eneric nervous system

peristalsis

smooth muscle contraction that move food through the digestive track

voluntary muscle movement are controlled by

central nervous system (CNS)

voluntary muscle movement in digestive system include

initiation of swallowing, defecation (but only after infant period)

involuntary muscle movement is controlled by

enteric nervous system (ENS)

involuntary muscle movement in digestive system include:

movement of food through the digestive track (peristalsis), and defecation but only early in life