Contractile vacuole - protozoans, Biology

Assignment Help:

Contractile vacuole - Protozoans

The contractile vacuoles may differ in complexity in various groups of protozoans. In amoebae the vacuoles are carried around in the cytoplasm. 'Small vesicles join them emptying their contents into the vacuoles till the vacuole joins the membrane emptying its content to the outside.

In ciliates (e.g. Paramecium) the contractile vacuoles have a more complex structure. The contractile vacuole is located in a fixed position with an excretory pore leading to the outside surrounded by ampullae of feeder canals. The feeder canals are surrounded by a network of fine canals (20nm) in diameter, which are also connected to the tubular system of endoplasmic reticulum. The ampullae are surrounded by a bundle of fibrils that may have a role in contraction of the ampullae. The ampullae contract thereby, filling the vacuole and when the contents of the vacuole are discharged to the exterior the ampulae get disconnected so that back flow is prevented.

2370_Contractile vacuole - Protozoans.png

Figure: The contractile vacuole of Amoeba proteus is surrounded by tiny vesicles that fill with fluid, which is then, emptied into the vacuole. Note the numerous mitochondria that are believed to provide energy needed to adjust' the salt - content of the tiny vesicles.


Related Discussions:- Contractile vacuole - protozoans

What is polyembryony, Q. What is polyembryony? Polyembryony is the phen...

Q. What is polyembryony? Polyembryony is the phenomenon in which a single embryo in its initial embryonic stage divides itself forming many new individuals of genetically ident

Disease occurrence due to climate change in animals, Disease occurrence due...

Disease occurrence due to climate change The movement of animal diseases across physical and political boundaries threatens food security and creates a global public co

Drug effects on food intake - cause sore or painful mouth, Define Drug effe...

Define Drug effects on food intake - Cause sore or painful Mouth? This is a common side effect of chemotherapy and can significantly affect food intake. Antineoplastic drugs, u

Define root canal perforations - time of treatment, Define Types of Root Ca...

Define Types of Root Canal Perforations According to the time of treatment According to the time of treatment in relation to occurrence: Fresh perforation: treated immed

Define the incubator - food microbiology, Define the Incubator - Food Micro...

Define the Incubator - Food Microbiology? The growth of the microorganisms is altered by the chemical and physical nature of its surrounding. Most important environmental featu

Which are the 2 main divisions of autonomic nervous system, Question 1....

Question 1. Which are the 3 different processes in the formation of urine? Explain 2. Discuss resting membrane potential and nerve action potential 3. Name the chemical s

Eyeball - sclerotic, SCLEROTI C - White of eye. Outer thick, made u...

SCLEROTI C - White of eye. Outer thick, made up of fibres connective tissue. Protective layer. Give definite shape. Its anterior 1/6 part is thin, transparent known as

Life cycle of sporozoans, Life cycle of sporozoans The complex life cy...

Life cycle of sporozoans The complex life cycle of sporozoans typically involves an asexual and a sexual phase. Sporozoans are haploid except for the zygote. The zygote underg

Describe how a phagocyte destroys bacteria, Describe how a phagocyte destro...

Describe how a phagocyte destroys bacteria. The phagocyte forms a pouch in its cell membrane and engulfs bacteria in the pouch. It then pinches off the pouch to produce a vesi

Micro-organisms in medicines, In terms of western medicines, over 3000 anti...

In terms of western medicines, over 3000 antibiotics - including penicillin and tetracycline - are obtained from micro-organisms. Another product of micro-organisms i.e. cyclospori

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd