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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.
C dna is made from a mature m rna of eukaryotic cell with the utilization of enzyme called as reverse transcriptase. Steps in c dna creation 1. m rna is made and purified f
Why does each skeletal muscle need an antagonistic partner? Because muscles can only contract and relax, each skeletal muscle requires an antagonistic partner to extend it afte
Wound breakdown With careful flap design and gentle tissue handling this is a rare complication. The healing which follows is by secondary intention and can be aided by chlorhe
What is the effect of physical activity on health? The Surgeon General's report (1996) summarizes the effects of physical activity on health as follows. Overall Mortality: H
what are the characteristics of cleavage formed in coelenterates?
How is the concept of chromosome related to the concept of the gene? A chromosome is a DNA molecule and chromosome may contain several different genes and as well DNA portions
10 organisms &there mode of nutrition
what is the protozoa?
Epidemiology Infection is transmitted by direct contact between infected domestic and wild animals and susceptible livestock; by arthropod vector (Phlebotomus, Aedes and Cul
What is the structural flat representation of an amino acid molecule? An amino acid has a central carbon to which a carboxyl group binds on a side and to which a -R (variable r
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