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Transcript
The Heart—Activity 1 Name ________________________________________________ Date _________________ Class Period ___________ The Heart Is a Pump You may have heard that you should have good cardiovascular fitness. Cardio stands for heart, and vascular stands for blood and circulatory system. Your life depends on the two working together and doing their jobs. The main purpose of the heart is to pump blood throughout your body. It delivers oxygen-rich blood to every cell and picks up carbon dioxide. The lungs are where carbon dioxide is used and exchanged for oxygen. The heart is a pump with four chambers. The muscle fibers allow the heart to contract and then relax. It works continuously, expanding to flow in blood and contracting to pump out blood. To get an idea of how the heart works when it contracts, close your fist to indicate blood pumping out, then open and relax your fist to indicate blood flowing into the heart. The heart has two pumps, with right and left sides. These sides are separated in the middle by the septum. Each side of the heart has two chambers with valves that allow blood to flow through the heart. The upper, receiving chamber is the atrium. The lower, pumping chamber is the ventricle. Figure 1.1 illustrates the different chambers of the heart. Figure 1.1 Copyright © by The McGraw-Hill Companies, Inc. All rights reserved. Septum is shown by the line and divides the heart into right and left sides Right atrium Receiving chamber Left atrium Receiving chamber Right ventricle Pumping chamber Left ventricle Pumping chamber Right pump Left pump Fitness Zone Online The Heart The Heart—Activity 1 Name ________________________________________________ Date _________________ Class Period ___________ Heart Pump Activity The purpose of this activity is to understand how the heart functions as two pumps. 1.Place a tennis ball or racquetball in each hand. 2.Keep the following sequence: relax right, squeeze right, pause, relax left, squeeze left, pause. Look across the chart below from left to right, and note that you are squeezing your right hand before your left. Try to exert more force with the left hand, but keep the same pattern. Sound out the sequence as you do it, and see if you can get a regular rhythm. Right Atrium Right Ventricle Lungs Left Atrium Left Ventricle Body Relax Right Squeeze Right Pause Relax Left Squeeze Left Pause Note: If you were to perform this activity every other day, the muscles in your hands and arms would become stronger. This is what happens to your heart when you exercise the muscle appropriately. You want your heart to be as C01-02A exercise (exercise that works strong as possible. This is why cardiovascular the heart) is very important. Evaluation 1.Describe how your hands and forearms felt during the activity. ___________________________________________________________________________________ ___________________________________________________________________________________ 2.What happened to your own heart rate or breathing during the activity? ___________________________________________________________________________________ ___________________________________________________________________________________ Fitness Zone Online The Heart Copyright © by The McGraw-Hill Companies, Inc. All rights reserved. 3.Continue the sequence for 3 minutes.