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2015/01/23

MONTESSORI ZOOLOGY : Body Functions of Mollusca




Movement

 The clam moves by using a "foot"
which can be extended from the shell.


Respiration

 The entire body surface is in contact with water
 and derives its oxygen from it. However, it does
 have a heart which circulates the oxygenated 
blood. Respiration occurs by gills that 
bring blood to the surface of the water.


Protection

 The shell is hard, the inner body is soft.

Image result for mollusc clam

Support

 The skeleton of the mollusca is
non-existent. Its very name, which
means "soft body," indicates the lack of a
skeleton. However, some mollusca secrete
a substance which produces a protective
outer shell, such as a clam.


Circulation

Circulation occurs by means of a chambered
heart (analogous to the vertebrate heart) which 
pumps the blood. There are one or two
 auricles and one ventricle.


Reproduction

 Reproduction is sexual.

       

 Pinegreenwoods Montessori
Montessori Zoology