2030lecture5 - OUTLINE Protozoa 1. Introduction 2....

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1 OUTLINE Protozoa Animal Diversity 5 th Ed. Chapter 5, Pages 89 - 111 Animal Diversity 4 th Ed. Chapter 5, Pages 88 - 109 1. Introduction 2. Locomotion 4. Osmoregulation 5. Reproduction (assigned reading) c c c Lecture 5 - 1 EXCRETION Elimination of undigested material within digestive vacuole occurs via fusion with cell surface (i.e. ENDOCYTOSIS in reverse) EXOCYTOSIS Metabolic wastes- e.g. end products of nitrogen metabolism, such as ammonia, readily diffuses across cell membrane PASSIVE DIFFUSION Waste material accumulates in a vacuole adjacent to the cytoproct and is periodically discharged (e.g. in ciliates) CYTOPROCT - permanent excretory pore Lecture 5 - 2
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2 OSMOREGULATION Hydromineral balance is regulated by specialized organelles called contractile vacuoles - Contractile vacuoles are commonly found in freshwater (i) Freshwater is more dilute than the internal environment of the protozoa (ii) Diffusive ion loss and water uptake by osmosis
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2030lecture5 - OUTLINE Protozoa 1. Introduction 2....

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