QUESTION 3 The flat worm (Planeria) represents a key stage of evolution of the n
ID: 222213 • Letter: Q
Question
QUESTION 3
The flat worm (Planeria) represents a key stage of evolution of the nervous system because...
the receptor cells, ganglion cells, and effector muscle cells are contained within the external epithelium
the muscle cells have become integrated into the skeletal system for movement
the inner layer of the mouth funnel of the Laminaria has the ganglion cell deep to the surface epithelium
the ganglia are localized outside of the esophagus altogether
10 points
QUESTION 4
Which of the following genes has evolved selectively for cold thermoreceptors?
MS
TRPM8
TRPV4
TRPA1
TRPV1
the receptor cells, ganglion cells, and effector muscle cells are contained within the external epithelium
the muscle cells have become integrated into the skeletal system for movement
the inner layer of the mouth funnel of the Laminaria has the ganglion cell deep to the surface epithelium
the ganglia are localized outside of the esophagus altogether
Explanation / Answer
Q3: the ganglia are localised outside oesophagus altogether
Q4: the genes TRPA1.
The cerebral ganglia is sometimes called as planarian brain from which to narava cauterize extending throughout the length of the body many transverse nerves are connected to the nerve ecourts extending from this brain making ladder like nervous system.
TRPA1 is a member of transient receptor potential channel family which is believed to function as mechanical and chemical stress tensor. This Ion channel is well known as a sensor for environmental irritants giving rise to somato sensory modalities such as pain cold.
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