Plasmodium vivax

Question 1

Plasmodium vivax

Answer 1

Classification
Phylum: Protozoa
Class: Sporozoa
Genus: Plasmodium
Species: vivax
Common Name: Malarial Parasite

Question 2

Habit and Habitat

Answer 2

• It is wide spread in tropical and temperate countries
• It is intracellular parasite of human living in liver cells and RBC cells
• While extracellular parasite of mosquito living in alimentary canal
  (gut) and salivary gland
• It comprises several species (60) among them four are medically
  important to us. They are;
• Plasmodium vivax
• P. falciparum
• P. ovale
• P. malariae

Question 3

Structure of P. vivax

Answer 3

• It shows different shape of the body in different stages of its lifecycle
• It may be;
• Elongated or spindle shape – sporozoite
• Round or spherical shape – trophozoite
• Oval shape – merozoite
• Ring shape – signet ring stage
• Irregular shape – amoeboid stage
• A fully grown trophozoite is amoeboid in shape
• Body is covered with plasm membrane with no differentiation of
  ectoplasm and endoplasm
• Cytoplasm consists of single nucleus with mitochondria, golgi
  complex, endoplasmic reticulum, ribosome vacuole, haemozoin etc.

Question 4

Life Cycle

Answer 4

Digenetic parasite, i.e. lifecycle completes in two hosts
* Definitive Host (Primary Host):
Female anopheles mosquito
* Intermediate Host (Secondary Host)
Human

Question 5

Asexual Life Cycle in Human

Answer 5

Schizogony:
* Process of asexual reproduction by which Plasmodium undergoes
asexual multiplication
* It occurs in human liver cell (liver schizogony) and in RBC
(erythrocytic schizogony).
* When an infected female Anopheles mosquito bites a person, it
injects thousands of sporozoites along with saliva into the
bloodstream