what tastes good? smell and taste smell olfactory
TRANSCRIPT
What tastes Good?
Smell and Taste
Smell Olfactory
The organs of taste & smellSmell:
A. Olfactory membrane:– Contains over 15 million nerve cells
(stimulated by odorous substances)
B. Conditions needed for odours to be perceived:– Be in a gaseous state– Contain a sufficient number of odorous molecules; in high
concentration– Be carried by the air to the olfactory membrane
C. Chain reaction involved in smelling:
– Receiver = Nose– It receives the stimuli which are odours
– Transformer = Nerve cells of olfactory membrane– They transform the odours into nerve impulses
– Conductor = Olfactory nerve– It conducts nerve impulses from the olfactory
membrane to the olfactory bulb in the brain
– Analyzer = Brain– It analyses incoming nerve impulses from the
olfactory nerve
The smell part of the brain is in the limbic region, and is connected to feeling and memory.
Taste (the tongue):Taste (the tongue):• mainly composed of muscles.• covered with a mucous membrane.• Small nodules of tissue (papillae) cover the
upper surface of the tongue.• Between the papillae are the taste buds,
which provide the sense of taste. • In addition to taste, the tongue functions in
moving food to aid chewing and swallowing, • It is also important in speech.
Taste (tongue):A. Taste buds or papillae (location &
function):
– Tongue is a muscular organ that contains most of the body’s taste buds
B. Conditions needed for tastes to be perceived:– Be in solution in the saliva.– Contain a sufficient number of flavourful
molecules– Come into contact with the papillae (taste
buds)
Video
C. Chain reaction involved in taste:
– Receiver = Tongue– Receives the stimuli which is tastes
– Transformer = Taste buds– Transforms tastes into nerve impulses
– Conductor = Gustatory nerve– Conducts nerve impulses to the taste center of
the brain
– Analyzer = Brain– Analyzed incoming nerve impulses from the
gustatory nerve
D. 4 basic taste sensations:Salty, Sweet, Sour, BitterTongue to label