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How is heart contraction triggered?
Heart contraction is independent from neuronal stimulus (although it can be modulated by the autonomous nervous system). In the heart there are pacemaker cells that trigger by themselves the action potentials that start the muscle contraction. These cells are concentrated at two special points of the heart: the sinoatrial node (SA node) situated in the superior portion of the right atrium and the atrioventricular node (AV node) situated near the interatrial septum.
A few statements about the mechanism of evolution are made. Mark the correct statements. (i) Evolution happens at the individual level as well as population level. (ii
What are the benefits of high-throughput expression analysis in molecular biological investigations? Ans) These methods permits simultaneous analysis of the expression of a lot
Q. Why is maternal milk important for the immune protection of the baby? Besides being nutritionally important like maternal milk participates in the defense of the baby agains
Q. Do amphibians have direct development? In amphibians the embryonic development is indirect there is a larval stage. Q. How different are the respiration in adult amphibi
Explain Low birth weight infants (LBW)? One-third of the babies born in US are of low birth weight, less than 2.5 kg. A LBW infant has an inadequate mineralized skeleton, poorl
If water dousing, homeopathic cures, and so on work for just me but not for anyone else, it is still science.
Define the Use of Computers in Numerical Taxonomy The use of computers in numerical taxonomy has made it possible to compare a large number of characters from many organisms wi
Aneuploidy : One or inore chron~osomes of a normal set nlay bc lacking or present in excess. The term riullison~y refers to absence of both the chromosomes of a pair. Monosomy, tri
Tidal energy The periodic rise and fall of water level of sea is called tides which are caused by gravitational effect of moon combined with the rotation of the earth. This var
Explain the Process of dna technology Procedures involving recombinant DNA technology has been used to increase the yield of enzymes already produced by the microorganisms, e.
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