Cell Size and Scale Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny. Smaller cells are easily visible under a light microscope. To see anything smaller than 500 nm, you will need an electron microscope. Adenine The label on the nucleotide is not quite accurate. How can an X chromosome be nearly as big as the head of the sperm cell? No, this isn't a mistake. The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis. A chromosome is made up of genetic material (one long piece of DNA) wrapped around structural support proteins (histones). Carbon The size of the carbon atom is based on its van der Waals radius.
Creative Commons License Heart Contraction and Blood Flow - NHLBI, NIH The animation below shows how your heart pumps blood. Click the "start" button to play the animation. Written and spoken explanations are provided with each frame. Use the buttons in the lower right corner to pause, restart, or replay the animation, or use the scroll bar below the buttons to move through the frames. The animation shows how blood flows through the heart as it contracts and relaxes. Heartbeat Almost everyone has heard the real or recorded sound of a heartbeat. A heartbeat may seem like a simple, repeated event. Each side of your heart uses an inlet valve to help move blood between the atrium and ventricle. Each of your heart's ventricles also has an outlet valve. Each heartbeat has two basic parts: diastole (di-AS-toe-lee) and systole (SIS-toe-lee). During diastole, the atria and ventricles of your heart relax and begin to fill with blood. The atria then begin to relax. Pumping Action Your heart uses its four valves to ensure your blood flows in only one direction.
The Circulation Game Purpose of activity: To learn (or review) information about circulation. Basic science concepts covered: distribution of oxygen to cells and carbon dioxide to lungs via red blood cells, production of red blood cells in bone, delivery of sugar and protein to cells via the blood stream, delivery of wastes to the kidneys for disposal out of the body, the heart as the driving force that keeps the blood moving, the “map” of the circulatory system in and out of lungs, heart and body parts. Description: This is a two-team game that can accommodate 2-6 players (possibly 7 or 8). Target age group: ages 8-14 Time allowance: 30-60 minutes to assemble (time greatly depends on how much coloring is done and if assembly is being done by students in class or adults ahead of time) and 30-45 minutes to play Materials needed: Copies of the pattern pages on white card stock, scissors, X-acto knife, clear packaging tape, colored pencils, white glue, thin cardboard (cereal boxes work) Comments are closed.
Zybright | Freebie Library Fun freebies! My Incredible Body is a dynamic anatomy app: just for kids! Fill out the form to the right to get our fun free anatomy activities, which match up perfectly with the content presented in the app. It's a great way to keep kids learning! NEW! Reproductive System FAQs: Why am I starting to sweat more? Don't have the app? My Incredible Body lets kids investigate, experience, and learn human anatomy in a fun, dynamic new way. Get it now! Good Call-To-Action Buttons What can you do to make your calls-to-action more effective? The call-to-action button is an important tool in the user experience designer’s box of tricks. In this article I’ll give you a few pointers on providing effective ones. Prioritizing tasks Some tasks on your website are more important than others. Essentially, both analogies make the point that the majority of your site’s value is provided by a small number of tasks. With these priority tasks, you need to remove any friction that slows the user’s progress. Choosing your words carefully Buttons are for actions, like ‘Get a quote’, ‘Download’, ‘Open an account’, ‘Go to checkout’. Think about what your user would say if you asked him what he was trying to do. Using the right words reduces the friction of your key tasks. Cultural subtleties can be the cause of task friction as well. British people use trolleys (carts) or baskets when in real stores, so in the UK, Amazon calls the ‘Shopping Cart’ the ‘Shopping Basket’. Positioning Size
Your Heart's Electrical System he animation below shows how your heart's electrical system works. Click the "start" button to play the animation. Written and spoken explanations are provided with each frame. Use the buttons in the lower right corner to pause, restart, or replay the animation, or use the scroll bar below the buttons to move through the frames. The animation shows how the heart's internal electrical system causes the heart to pump blood. Your heart's electrical system controls all the events that occur when your heart pumps blood. Your heart's electrical system is made up of three main parts: The sinoatrial (SA) node, located in the right atrium of your heartThe atrioventricular (AV) node, located on the interatrial septum close to the tricuspid valveThe His-Purkinje system, located along the walls of your heart's ventricles A heartbeat is a complex series of events. Each heartbeat has two basic parts: diastole and systole. This signal causes the atria to contract.
PIG HEART!!!!!!! > Blood Cell Bingo Game Purpose of activity: To review information about all types of blood cells, both red and white cells. Target age group: ages 10 and up (great for high school!) Time allowance: 5-15 minutes per game (play multiple games) Description: This is standard bingo except that the board is made of moveable, double-sided pieces. There are four levels of clues, so the game can easily be played multiple times. Also included are two “cheat sheets” that can be handed out to the players, making the game more of a learning activity and less of a guessing game (since the clues require remembering facts). This game is recommended as a review activity, not as a method of initial teaching. 6 Copies of pattern pages printed onto card stock, some copies on regular paper, about 15 tokens for each player (pennies, candies, etc.) Click here to download Blood Cell Bingo Game Comments are closed.
NOVA - Official Website | Map of the Human Heart Map of the Human Heart Day and night, the muscles of your heart contract and relax to pump blood throughout your body. In the Step Thru below, see the complicated path the blood takes as it moves in and out of the heart. Step Thru Animation Oxygen-poor blood (shown in blue) flows from the body into the right atrium. Anatomy Do right and left seem backward? aortasuperior vena cavaright atriuminferior vena cavapulmonary valvetricuspid valveright ventriclemitral valveleft ventriclepulmonary arteryaortic valveleft atrium Heart Facts Put your hand on your heart. Hold out your hand and make a fist. Give a tennis ball a good, hard squeeze. The aorta, the largest artery in the body, is almost the diameter of a garden hose. Feel your pulse by placing two fingers at pulse points on your neck or wrists. Your body has about 5.6 liters (6 quarts) of blood. The heart pumps about 1 million barrels of blood during an average lifetime—that's enough to fill more than 3 super tankers.