Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
Related questions
Question
Q13
Transcribed Image Text:A
くイーアーン
Water flows into the sponge at opening A or B?
B
Expert Solution
Step 1
Sponge belongs to the phylum Porifera. Poriferans have numerous small openings in their body called ostia (singular ostium) and a large opening called the osculum. Water enters the sponge through ostia into the spongocoel. From there water leaves the body through the osculum. Flow of water is unidirectional and helps in different processes like food accumulation, exchange of respiratory gases, excretion etc.
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