Download App

STD 11 - 15. Body fluids and criculations — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 15. Body fluids and criculations1 Mark
MCQ
Heart beats are controlled by a nodal tissue which is composed of
  • ✓
    Purkinje fibres
  • B
    Myonemes
  • C
    Collagen fibres
  • D
    Telodendrites
✓

Answer

Correct option: A.
Purkinje fibres
a
(a) Initiation of heart beat is under special bundles of cardiac muscles called nodal tissue or autorhythmic cells. Nodol tissue consists of $S.A.$ node, $A.V.$ node, bundle of his and purkinje fibres.

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 "M.C.Q (1 Marks)" from STD 11 - 15. Body fluids and criculations→STD 11 - 15. Body fluids and criculations — all question types→BIOLOGY STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

$A$ : Assimilatory power in photosynthesis is generated in $ETS$ occuring in thylakoid membrane.
$R$ : They are needed for $CO_2$ reduction and $RuBP$ regeneration.
→
$A$ : Chloroplast is a semi-autonomous organelle.

$R$ : The ribosomes of the chloroplast are smaller than cytoplasmic ribosomes.

→
Aromatic amino acids contain which reactive group?
→
The vein that supplies nutrients from the intestine to the liver, is:
→
Dwarfism occurs when there is

$(i)$ Over secretion of growth hormone $(ii)$ Under secretion of growth hormone
$(iii)$ Over secretion of somatostatin $(iv)$ Under secretion of somatostatin

→
Nerve cells do not divide because they do not have:
→
Main axis continues to grow, the flowers are borne laterally in acropetal succession. This is a characteristic of which type of inflorescence?
→
Notochord derived form
→
Bordered pits are found in
→
Male frogs can be distinguished from female frogs by the presence of
→