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			<div class="col-md-6 col-sm-12 col-xs-12"><h3><span >Healthcare and Medicine: The Heart</span></h3></div>
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		<p style="margin:0;">Your heart sits in the middle of your chest and pumps blood from about 4 weeks after conception until the day that you die.  It never stops, and over your lifetime it will pump ~175 million liters of blood.  To visualize that, imagine the amount of water that falls over Niagara falls in a few minutes.  Remarkable!  This little pump is the size of your clenched fist and in an adult can weigh about 300 grams.  Watch these videos to learn more about how the heart works, blood flow in arteries and veins, and blood pressure.<br>Meet the heart!. Layers of the Heart. Flow through the Heart. Two Circulations in the Body. Lub Dub. Heart Quiz. Circulatory System and the Heart. Arteries vs. Veins - What&#x27;s the difference?. Layers of a blood vessel. Arteries, Arterioles, Venules, and Veins. Three Types of Capillaries. Pre-Capillary Sphincters. What is blood pressure?. Learn how a stethoscope can help determine blood pressure. Resistance in a tube. Adding up resistance in series and in parallel. Adding up resistance problem. Flow and Perfusion. Putting it all together: Pressure, flow, and resistance. Blood pressure changes over time. Regulation of blood pressure with baroreceptors. Parts of a nephron. General overview of the RAAS system - Cells and hormones. Renin production in the kidneys. Activating Angiotensin 2. Angiotensin 2 raises blood pressure. Aldosterone raises blood pressure and lowers potassium. Aldosterone removes acid from the blood. ADH secretion. ADH effects on blood pressure. Aldosterone and ADH. Meet the heart!. Layers of the Heart. Flow through the Heart. Two Circulations in the Body. Lub Dub. Heart Quiz. Circulatory System and the Heart. Arteries vs. Veins - What&#x27;s the difference?. Layers of a blood vessel. Arteries, Arterioles, Venules, and Veins. Three Types of Capillaries. Pre-Capillary Sphincters. What is blood pressure?. Learn how a stethoscope can help determine blood pressure. Resistance in a tube. Adding up resistance in series and in parallel. Adding up resistance problem. Flow and Perfusion. Putting it all together: Pressure, flow, and resistance. Blood pressure changes over time. Regulation of blood pressure with baroreceptors. Parts of a nephron. General overview of the RAAS system - Cells and hormones. Renin production in the kidneys. Activating Angiotensin 2. Angiotensin 2 raises blood pressure. Aldosterone raises blood pressure and lowers potassium. Aldosterone removes acid from the blood. ADH secretion. ADH effects on blood pressure. Aldosterone and ADH. </p>
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