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<u>Answer:</u>
The main purpose of the national research projects, the National Health and Nutrition Examination Surveys (NHANES) and the Continuing Survey of Food Intakes by Individuals (CSFII) is to "determine what the nutrient and dietary intakes of the population in our country are".
<u>Explanation:</u>
The National Health and Nutrition Examination Surveys (NHANES) is organized by National Center for Health Statistics (NCHS), in order to assess the U.S. population's total nutritional status through dietary interviews, health and medical histories, laboratory measurements and physical examinations.
Results or outcome from this survey is utilized to find out the widespread presence of main illnesses and disease vulnerability or risk. The acquired data will be used to assess nutritional flow and associate it with health promotion and the prevention of diseases.
The process of heart contraction stimulates by the initiation of an electrical impulse. This electrical impulse starts in the SA node.
<h3>What is the Heart contraction?</h3>
Heart contraction may be defined as a type of physiological activity that stimulates electrical impulses which are initiated by the sinoatrial node. Systole is significantly the contraction phase of the cardiac cycle.
The SA node is a small bundle of specialized cells that is remarkably located in the right atrium. The electrical activity escalates through the walls of the atria and induces them to contract. This action finally forces blood into the ventricles.
Therefore, the SA node is responsible for the initiation of impulses that stimulates heart contraction.
To learn more about Heart contraction, refer to the link:
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Those are called dynamic movement exercises because they involve movement of the joints and active movement of certain muscles.
Patient self-determination act of 1990
