MODULE 2 UNIT 1 Flashcards
one of the three major groups of parasites that are of medical importance to man
Protozoa
performs all the functions of life, i.e., reproduction, respiration, excretion, etc.
single cell unit
carried on by specialized cells
higher organisms
They have remarkable range in size and form, some visible to the naked eye, while others require magnification up to a thousand fold before they can be seen. INTRODUCTION
Protozoa
Some are spherical or ovoidal, while others have bizarre contours.
Protozoa
are found in all moist habitats
Protozoa
Protozoa are common in
sea, in soil and in fresh water.
“first animal”
‘protos’ and ‘zoon’
they often possess animal-like behaviors, such as motility at some stage of their life cycle
“one-celled animals”
three phyla of protozoa of medical interest in humans
• Phylum Sarcomastigophora • Phylum Ciliophora •Phylum Apicomplexa
includes subphylum Sarcodina, and, subphylum Mastigophora
Phylum Sarcomastigophora
T or F: Although, protozoa exhibit marked diversity in size, shape, and other characteristics, there are fundamental characteristics common to the entire group.
TRUE
The structure of a protozoan cell is composed of
(1) cytoplasmic body, and (2) a nucleus
The various life functions are carried out by specialized intracellular structures known as
organelles
consists of a thin outer ectoplasm and a voluminous inner endoplasm
cytoplasm
very complex in electron microscope
cytoplasm
appears more transparent, less granular, and more homogeneous
Ectoplasm
It is covered with plasma membrane that is like those found in all cells.
Ectoplasm
functions of cytoplasm
movement, respiration, procurement of food, discharge of metabolic wastes, and protection
The locomotory organelles of protozoa arise from the
ectoplasm
are temporary extensions of the ectoplasm and are found in amoebas under the subphylum Sarcodina
Pseudopodia
are long, slender, whiplike structures seen in subphylum Mastigophora
Flagella
subphylum Mastigophora are also called
flagellates
T or F: They may have one or more than one flagellum, and these may be inserted into the cell at different angles.
TRUE