BIO325H5 Lecture Notes - Lecture 4: Filter Feeder, Antiseptic, Protozoa

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Published on 18 Apr 2016
School
UTM
Department
Biology
Course
BIO325H5
Professor
BIO325 Lecture 4
Mucus: is a viscoelsc sol-gel common in animals (t that picture if you can somewhere)
Mucus: soluon of glycoproteins that has ansepc enzymes (like lysozymes)
oacts against microbes and funcons like a barrier against bacteria and viruses and as a
#lter
#lter feeding animals use it to eat parculate food
oproduced by cells in the bo$om amphioxus, driven up the pharynx and traps small
protozoa (eg/ diatoms)
Gastropods- snails
name refers to change of mantle cavity to a lung
have a single foot that moves in waves
the waves are accompanied by a thing layer of pedal mucus
ditacc gastropods have a foot thats divided into two and monotacc snails have one (both
move in waves)
Locomoon in gastropods (check out diagram)
single locomotory appendage (muscular foot): adheres to the surface via thin layer of mucus
q: how can an animal with one foot walk on glue?
oMuscular waves on the ventral surface on the foot
oPeriodic muscle contracons (pedal waves) and relaxaons (interweaves)
Propagate from tail to head
The mucus and the wave foot is good cause it resists against gravity and helps with foraging
For this to work there need to be a Purchase which grips onto one spot while the wave propels
forward
Also there are mulple waves to it (12-17) and ulmately translates to adhesive locomoon
Pneumostome: Entry to the lung (its an opening) and its what the mantal was converted to
Viscoelasc: is what the pedal foot is, and it means that it changes its properes as the material
is placed under stress
Evoluon of Gastropods
Pedal gland: where the mucus comes from
Pulmonate snails have adapted to land by eliminang the gills and converng the mantle cavity
into the lung
The shell is absent in slugs and squids but used by snails as a protecve retreat to prevent
mechanical stresses
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Document Summary

Mucus: is a viscoelstic sol-gel common in animals (fit that picture if you can somewhere) The mucus and the wave foot is good cause it resists against gravity and helps with foraging. For this to work there need to be a purchase which grips onto one spot while the wave propels forward. Also there are multiple waves to it (12-17) and ultimately translates to adhesive locomotion. Pneumostome: entry to the lung (its an opening) and its what the mantal was converted to. Viscoelastic: is what the pedal foot is, and it means that it changes its properties as the material is placed under stress. Pulmonate snails have adapted to land by eliminating the gills and converting the mantle cavity into the lung.

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