How do the tube feet of sea stars and sea urchins operate?
A) Sticky threads lead back to the mouth and primitive brain
B) Cilia transport hemolymph from chamber to chamber
C) Actin and myosin in muscles in the five arms or "rays" constrict the tube feet directly when stimulated by nerves from the sea star brain
D) A hydraulic system regulates water pressure in the tube feet
E) Each tube foot is an independent organism and the sea star is a colonial mass
Correct Answer:
Verified
Q31: The respiratory tree of a sea cucumber
Q32: Sea stars reproduce mostly
A)by budding.
B)only asexually by
Q33: The five pairs of bursae in brittle
Q34: The designation of hemichordates as primitive chordates
Q35: If you went to the ocean and
Q37: Which is NOT a correct association of
Q38: The role of the hemal system is
Q39: The echinoids
A)have five long,slender arms.
B)are enclosed in
Q40: Echinoderm evolution is controversial but most zoologists
Q41: Hemichordates were not recognized until the 1800s
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents