Download App

Respiration and Circulation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYRespiration and Circulation4 Marks
Question
Why does our immune system fail against pathogens like Trypanosoma cruzi and Plasmodium?
✓

Answer

$1.$ Microbes have evolved a diverse range of strategies to destroy the host immune system. The protozoan parasite Trypanosoma cruzi and Plasmodium show similar such adaptations to disturb host defence mechanism.
$2.$ This parasite attacks host tissues including both peripheral and central lymphoid tissues.
$3.$ This causes systemic acute response in host body which the parasite tries to overcome. The parasite in fact weakens both innate and acquired immunity.
$4.$ It interferes with the antigen presenting function of dendritic cells via an action on hosts like lectin receptors. These receptors also induce suppression of $CD_4^+ \ T$ cells responses. Therefore, our immune system fail against such pathogens.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following in detail :" from Respiration and Circulation→Respiration and Circulation — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Describe the process of double fertilization in angiosperms and add a note on its significance.
→
Write the statements of three laws of inheritance given by Mendel.
→
Describe the structure and the function of thrombocytes.
→
Directional selection.
→
Partial pressure of gases Alveolar air Pulmonary, capillaries
$PPO_2$ ————— —————
$PPCO_2$ —————- —————-
→
Karnataka, Chanda, Khasi, Rajasthan, Sarguja, Jaintia, Maharashtra, Bastar.
RegionSacred groves seen at
(1) Meghalaya—————
(2) Western ghat regions—————
(3) Aravali hills—————
(4) Madhya Pradesh————–
→
Give scientific : Pancreas is both exocrine as well as endocrine gland.
→
Classify the given plant growth regulators as per their specific control of event in plant life cycle in Column A and complete Column B.
(IAA, GA, Cytokinin, Abscissic acid)
Column AColumn B
(1) Shedding of leaves————-
(2) Induce flowering in LDP————
(3) Apical dominance————-
(4) Induce RNA synthesis————-
→
Neanderthal man.
→
Incomplete dominance and Co$-$dominance.
→