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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.
Illustrate the techniques of neurology A long-standing technique in neurology has been observed the effects on behaviour of lesions (cutting) or ablation (removal) of nerve tis
Q. Which are intracellular organelles present in bacteria? Considering typical eukaryotic cell organelles heterotrophic bacteria have ribosomes essential for protein synthesis.
Convergent evolution is the development of the similar type of structures in distantly related organisms as a result of adapting to similar environments or strategies of life. For
The gaseous pollutants can be controlled through the techniques of combustion, absorption adsorption and cold trapping. (a) Combustion: Though combustion is a major cause of i
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Which of the following statements are true for fluid exchange between the blood plasma in a capillary in the leg and the interstitial spaces surrounding that capillary? A. Bloo
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