Answer:
Venous return (VR) is the flow of blood back to the heart.
Venous return to the right atrium is the most important factor determining cardiac output, provided both ventricles and the pulmonary circulation are normal.
Explanation:
Venous return refers to the flow of blood from the periphery back to the right atrium, and except for periods of a few seconds, it is equal to cardiac output.
Venous return is facilitated by a number of factors, including inspiration, increased total blood volume, increased venomotor tone, the cardiac suction effect, the presence of venous valves and the skeletal muscle pump.
Contraction of the skeletal muscles surrounding veins increases the pressure within the veins, pushing open the proximal valve and forcing blood toward the heart. For example, when calf muscles contract during exercise, blood is forced toward the heart, thus increasing venous return.
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The reason why Carbohydrates and fats are considered high-energy foods is because they have a lot of electrons associated with hydrogen.
<h3>What are carbohydrates?</h3>
The carbohydrates are a class of food that are known to be rich in energy. Carbohydrates are broken down to release energy.
The reason why Carbohydrates and fats are considered high-energy foods is because they have a lot of electrons associated with hydrogen.
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Answer:
C. a dog buries a bone in the backyard
Explanation:
A dog burying a bone in the backyard is not an observation in terms of scientific methods.
Observation is the process of acquiring data about a phenomenon under study.
Most times, senses are used in making observations. Our sense of taste, hearing, sight etc. comes handy when making observation.
Also, we can use some specialized equipment to make observations.
- A dog burying a bone in the backyard is not an observation. None of the senses nor instruments are used to gather any relevant information.
