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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.
Minerals :- Calcium Food Source Dairy products, leafy vegetables, tofu, fish bones green Nutritional/Functional role Essential nutrient: Deficiency lead
how does respiration in animals occur? what is respiration? what are the common types of respiration?
Explain about the Cellular senescence - Geriatric Nutrition? Aging brings about an irreversible state of growth arrest at the cellular level. Though the cells are viable and me
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LIGHT All of us know that the sun is the ultimate source of energy for all activities in our biosphere. The electromagnetic radiations from the sun supply energy which warms up t
Identify the signs and symptoms associated with death from mercury. Explain Please.
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Similar to all animal cells, protozoans are covered by a plasma membrane which surrounds cytoplasm of the cell, protozoan's integument or skin. Like all membranes, it's permeable;
Define the term Archenteron ? The name given to the primitive gut, the first tube that runs through the developing embryo and is open to the external environment. Formed during
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