Explanation:
The direction of waves of contraction in the heart are very important because they represent the cardiac contraction pathway. It begins from sinoatrial node due to spontaneous depolarization (nodal cells) and triggering of action potentials and transmission of the same to the cardiac cells taking part in the conduction pathway in the cardiac muscle fibers.
The blood flows from the right atrium to the right ventricle via the tricuspid valves when the atrium contracts and ventricles expand. Once the ventricles receive its full amount of blood the tricuspid valves shuts to prevent any backflow of blood into the atrium. When the ventricles contract, blood enter the aorta through the aortic valve.
Iron is an important mineral required by the body to produce the ‘heme’ part of the protein hemoglobin present in the red blood cells of the blood. Oxygen binds with hemoglobin and is carried via blood to various parts of the body. Hence intake of recommended dietary allowance of iron is very important since deficiency can lead to various conditions like anemia.
Polycythemia vera is a condition which leads to increased production of red blood cells. this increases the blood volume and thickens the blood and slows down the blood flow and causes blood clots. The slowness of blood flow and formation of blood clots can lead to heart failure and heart attacks respectively.
Answer:
While boating/on the water.
Explanation:
Boating safe advocates recommend all boaters and passengers wear a life jacket at all times while boating/on the water. This is to protect them if they get thrown overboard, sink, etc...
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Answer:
CDC gets its financing from Congress through different accounts that relate around to CDC's focuses, establishments, and workplaces. These records are additionally partitioned into explicit projects, undertakings, and exercises. The major source of CDC funds is from a budget authority, which are determined by the U.S. Congress annually.
It is a federal organization that is funded by mainly US congress or government to prevent and plan for the possible disease threats to the US so it is accountable to the government and citizens for making proper and quality plans.
The correct answer among the choices given is option B. Iodine-131 is one important isotope of iodine. It is used in nuclear energy, medical diagnostic and treatment and natural gas production. However, low dosages of the isotope in the body are more dangerous since they kill thyroid tissues that will result to cancer.
