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Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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Related Experiment Video

Updated: May 10, 2026

Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response
11:56

Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response

Published on: November 12, 2014

Diving mammals.

Paul J Ponganis1

  • 1Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA. pponganis@ucsd.edu

Comprehensive Physiology
|June 6, 2013
PubMed
Summary
This summary is machine-generated.

Diving mammals possess unique physiological and anatomical adaptations for extended breath-hold diving. These adaptations optimize gas exchange, oxygen storage, and tolerance to low oxygen and high pressure environments.

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Area of Science:

  • Physiology
  • Marine Biology
  • Comparative Anatomy

Background:

  • Diving mammals exhibit exceptional breath-hold capabilities essential for foraging.
  • Gas exchange in lungs and peripheral tissues is critical for sustained dives.

Purpose of the Study:

  • To explore the anatomical and physiological adaptations enabling deep, breath-hold dives in marine mammals.
  • To understand the mechanisms behind efficient gas exchange and oxygen utilization.

Main Methods:

  • Review of existing literature on marine mammal respiratory and cardiovascular systems.
  • Analysis of physiological data related to oxygen storage and gas transport.
  • Examination of tissue adaptations for hypoxemic and pressure tolerance.

Main Results:

  • Adaptations span respiratory, cardiovascular, and blood systems.
  • Key outcomes include efficient ventilation and enhanced oxygen storage.
  • Animals demonstrate regulated gas transport, hypoxemic/ischemic tolerance, and pressure tolerance.

Conclusions:

  • Multiple integrated adaptations contribute to remarkable breath-hold capacity.
  • These adaptations are crucial for survival and foraging in deep-sea environments.
  • Understanding these mechanisms provides insights into physiological limits and evolutionary strategies.