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Bring Science Home: Activity 17 Key concepts Cardiovascular system Exercise Energy and metabolism From National Science Education Standards: Personal health Introduction From your brain down to your fingers and toes, your body needs plenty of oxygen to keep going. That oxygen is carried through your body in the bloodstream. Blood is pumped through the heart and picks up oxygen as it passes by the lungs. Let's track your heart kicking it into high gear during exercise. But don't get moving just yet; first we need to count your resting heart rate. Background So, getting out of breath while exercising is just a sign that your muscles are working. The more you exercise, the more efficient your body will be at getting oxygen to your muscles, so you can exercise more without getting out of breath. Of course, pushing exercise too hard can be dangerous and, if you feel faint, you should stop the activity. Materials • Stopwatch or timer with a second hand • A person who has been relaxing for at least 15 minutes • Room to do jumping jacks • Pencil and paper Preparation • Start this activity well rested (sitting down to read for 15 minutes or so should do the trick). • Have a stopwatch handy. • Note: Be sure to drink plenty of water when you exercise. All of that work makes your body lose water through sweat—as well as moisture that is exhaled when you're breathing quickly. Procedure • Notice your breathing. How many breaths are you taking every minute? • Now, get ready to get moving! Make sure you have room enough for jumping jacks, and keep that stopwatch handy. • Do 20 jumping jacks (or as many as it takes to get out of breath). • Without resting, count the number of heartbeats you feel in 30 seconds. Write that number down and multiply it by two.• How much did your heart rate increase after the jumping jacks? • How many breaths did you take in a minute after the jumping jacks? • How did your breathing change? • Try other activities and see how they affect your heart rate and breathing. What does that mean about how much oxygen each one requires—and how much your muscles are moving? • After you exercise, try seeing how long it takes for your heart rate to return to its resting rate. Read on for observations, results and more resources. Observations and results As you exercise more, your body gets more efficient and does not require as much heavy breathing or quick heart pumping. People who exercise regularly can do so longer without getting out of breath as quickly. They also tend to have heart rates that return to their resting levels more quickly after physical activity. But of course, oxygen is not the only substance the body needs. We also need food for fuel. When we eat food, some of it is broken down by the body and transformed into the energy that gets us moving (these energy units are known as "calories"). More food does not always mean more energy. It depends on the type of food you are eating and how your body breaks the food down. For instance, the body can break down sugar and other processed carbohydrates, such as white bread, quickly. But sustained energy is better gained from foods that are harder to break down, such as lean protein and whole grains. While breathing at different rates helps control the amount of air the body uses, the amount of energy from food the body uses is controlled much differently. If the body gets way more energy (or calories) than it can burn off, it will often store it away as fat. What are some ways you and your friends and family can get more physical activity every day? Share your jumping heart rate observations and results! Leave a comment below or share your photos and feedback on Scientific American's Facebook page. More to explore Up next… What you'll need • Mixing bowl • Dirt • Plastic wrap • Clear drinking glass (slightly shorter than the rim of the mixing bowl) • Small round marble • Sunny ledge or warm surface • Warm water Discover world-changing science. Explore our digital archive back to 1845, including articles by more than 150 Nobel Prize winners. Subscribe Now!
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In order to continue enjoying our site, we ask that you confirm your identity as a human. Thank you very much for your cooperation. halimbawa kung paano sumulat ng journal Panuto: Sagutin ang mga sumusunod na tanong 1. Saan ang tagpuan ng kuwento? 2. Sa anong panahon naganap ang kuwento? 3. Paano nagsimula ang kuwento? 4 … ibigay ang mga kahulugan ng mga sumusunod : 1.diyalekto 2.bernakular 3.bilingguwanismo 4.multilingguwalismo pakisagutan po pls need ko po ngayon tandaan NYU dw tung pagmomok h nila haaha paano ka makatutulong upang maiwasan ang suliranin ukol sa climet change Mga karunungang - BayanAng hindi lumingon sa pinanggaliangan hindi makararatin sa paroroonan 1. Ano ang kalagayan ng ating wika bago pa man dumating ang mga dayuhan sa ating bansa? gumawa ng akdang tula na may 3 saknong brainly is so dry. what happened? :/// |