[steven_loves_sarah]

When fats and proteins are present in the duodenum,events occur that result in digestive enzymes being relased into duodenum from the pancreas.the gall bladder constracts and relases bile into the duodenum.its reasonable to say that
a- signalling molecules carry messages from the duodenum to both that gall bladder and pancreas.
b- signalling molecules would diffuse through tissue fluid that fills the spaces between the different organs.
c- increase in digestive enzymes from the pancreas result in an increase of fats and proteins in the duodenum.
d- increase in vile from the gall bladder reduces the break down of fats and proteins.
-the olfactory part of a brain is responsible for an animal's ability to smell. the brain of a black flying fox has a relatively large olfactory lobe,indicating that these flying foxes rely heavily on smell to find their food. signals between neurons in the olfactory lobe would occur by means of ?
enzymes
hormones
neurohormones
neurotransmitter