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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.
What are the analyses provided by the study of human age pyramids? The study of human age pyramids can give the following analyses: proportion of individuals at an economically
Define Active or moderately active Lifestyles - physical activity? These people have occupations that p-e not strenuous in terms of energy demands, but involve more energy expe
Consistently overwatering a potted tomato pla nt will eventually kill it. Using the map, suggest why waterlogged soil results in plant death. O2 cannot reach respiring root cells.
Q Beings from four phyla of the animal kingdom "breath" (do gas exchange) by diffusion. Which are those phyla? How is this type of respiration associated to features present in tho
What is linkage? Two genes are assumed to be under linkage, or linked, when they reside in the same chromosome. For instance, the research of the human genome discovered tha
The distinct ecological importance of species supports functional diversity and has a direct bearing on the species composition of the site, and therefore on overall biodiversity.
What is the kingdom Animalia explain? Kingdom Animalia : Kingdom Animalia is separated from the other four kingdoms on the basis of several clearly distinguishing features. T
Aid-giving behaviour between genetically related individuals in animal groups is often observed in nature. This aid-giving behaviour can evolve when the advantages of helping relat
Q What is the other name given to the sex chromosomes? What is the function of the sex chromosomes? Sex chromosomes are also known as allosomes the other chromosomes that are n
What is the function of the flagellum of the sperm cell? How is it formed? The flagellum of the sperm cell is produced by the centrioles that migrate to the region posterior to
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