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Interactive Lesson on the Heart
Transcript of Interactive Lesson on the Heart
Typically, a woman's heartbeat is faster than a man's by a few BPM (beats per minute).
The “lub-dub” of a heartbeat is the sound made by the four valves of the heart closing.
The human heart is approximately the size of your closed fist.
Though weighing only 11 ounces (less than a pound) on average, a healthy heart pumps 2,000 gallons of blood (7,600 4L milk jugs) through 60,000 miles (to San Antonio, TX and back 17-18 times) of blood vessels each day.
Oxygenated blood is blood that is rich in oxygen.
The study of the human heart and its various disorders is known as cardiology A Review on Homeostasis Homeostasis is the process by which the body maintains a balanced internal environment.
What part of the brain maintains this? What does homeostasis have to do with your heart? Your heart plays a role in maintaining homeostasis. It pumps blood to maintain proper oxygen and carbon dioxide levels within your body. Our Circulation... Proper oxygen and carbon dioxide levels are maintained in our body through blood flow. Blood flow throughout our body is known as our circulation. 1. Pulmonary Circulation
2. Systemic Circulation The blood vessels in our pulmonary circulation are responsible for carrying blood between our heart and lungs so that we can exchange carbon dioxide with the oxygen that we breathe in. The blood vessels in our systemic circulation are responsible for carrying blood throughout the rest of our body, providing our body with the oxygen it needs and sending oxygen-poor blood (rich in carbon dioxide) towards the lungs to be exhaled. While you're waiting...
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Join room m.socrative.com There are two different circulation systems within our body: Maintaining Homeostasis How does the heart maintain a balance between oxygen and carbon dioxide levels within the body? What is it that prevents oxygen-rich and oxygen-poor blood from mixing? 1. The right side is responsible for pumping deoxygenated (oxygen-poor) blood into the pulmonary circulation system so that it can exchange carbon dioxide with oxygen. The heart has two separate sides. 2. The left side is responsible for pumping oxygenated (oxygen-rich) blood into the systemic circulation system so that our body receives the oxygen it needs. Some helpful tips... Which side of the heart is considered the right side and which side of the heart is considered the left side? The left and right side of the heart are labeled relative to their location in the body. Think about your own heart: the left and right side of your heart from your perspective would opposite from the perspective of someone who is looking at you from the front.
This diagram seems complex, but pick a starting point!
The aorta is the main artery in the body and is approximately the diameter of your thumb. Why?
The arteries narrow down into arterioles and further into capillaries, which have very thin walls to enable oxygen and nutrients to seep out into the surrounding tissue in the form of tissue fluid.
The left side of the heart has a much thicker walled ventricle. Why do you think this is? The two sides of the heart are divided by the septum Valves The atrium and ventricle on each side of the heart are separated by flaps of tissue that are one-way valves There are valves that are located at the two points where the blood exits the heart (at the pulmonary artery and the aorta). This is why they are referred to as the pulmonary valve and the aortic valve. What role do valves play? Why are they important? The way the valves are structured prevent blood from flowing backwards or in the wrong direction. The Two Phases... The heart pumps blood in two phases:
In the systolic phase, the ventricles contract, pumping blood into the arteries to distribute it throughout the body.
In the diastolic phase, the ventricles relax and blood flows into them from the atria. How would we use the information gathered from the systolic and diastolic phases in understanding our health? These two phases of the heartbeat are measured when blood pressure (aka arterial blood pressure) is taken. Arterial blood pressure is the pressure exerted on blood vessel walls by circulating blood in the systemic circuit. During each heartbeat blood pressure between a minimum (diastolic) and maximum (systolic) pressure. High blood pressure increases the heart's workload as well as growth of unhealthy tissue on the arterial walls. Because the heart muscle is working harder to pump blood to the body, it will take less time for the heart to become weak. Some risks that arise with high blood pressure include heart attacks, strokes, and heart failure.
When you have a low blood pressure, your brain is not supplied with a sufficient amount of oxygen, therefore causing symptoms such as dizziness, fainting or lightheadedness. Student Activity Your Pulse We know that during each heartbeat, the muscles of your heart contract causing a wave of pressure which forces blood through the arteries. This wave of pressure is known as a pulse. There is one pulsation for each heartbeat.
The pulse can be felt at various points on the body where the arteries are just under the skin: temples, neck, elbow, wrist, groin, back of the knee, and the inside back of the ankle.
The normal pulse rate varies with age. Range of Heart Rates per Minute and Average Heart Rate for Various Ages
Age Range Average Rate
0-1 month 100-180
2-3 months 110-180
4-12 months 80-180
1-3 years 80-160 (130)
4-5 years 80-120 (100)
6-8 years 70-115 (100)
9-11 years 60-110 (88)
12-16 years 60-110 (80)
>16 years 50-90 (70) 1. Put your middle and index finger together and find your pulse on your neck or the inside of your wrist. 2. For 15 seconds, count the number of pulses you feel. Record this number on a piece of paper and multiply it by 4 (15 seconds x 4 = 60 seconds) 3. Jog one lap around the third floor of the education building OR do jumping jacks for 1 minute. Repeat step 2. so that you can determine your BPM. 4. When you compare your two results, what do you notice? What does this mean in terms of homeostasis? Some Final Questions/Thoughts What are the two circulation systems in your body?
Where does deoxygenated blood go to become oxygenated?
What are some things that could happen if your body does not receive the oxygen it needs?
A mouse's heart beats about 700 times per minute and an elephant's about 30. A mouse lives less than three years, an elephant more than 60. What's the connection?
What are some health issues that can arise if your heart is unhealthy? Please redirect yourself to m.socrative.com
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