A. Objective The learners should be able to investigate changes that happen in the absence of oxygen. B. Materials ● fire. Activity: TITLE: ABSENCE OF OXYGEN Jar with cover (Jar A) Jar without cover (Jar B) 2 same sized candle (small) Match or lighter Timer Ruler C. Precautionary Measure Remember to handle match or lighter carefully and don't play with it for it can cause D. Procedure 1. Label the jar with cover with Jar A and the jar without cover as Jar B. 2. Light the candles with a match and put the candles in each jar. 3. Record the time when the candles are lighted and the time when the light was put off. 4. Cover the Jar A and observe what will happen. 5. Measure the length of the candles after the flame was put off. 6. Record your findings on the chart below. Jars JAR A JAR B Time of the flame was put off Length of the candle after burning Answer the following questions: 1. Which of the 2 jars was the candle's flame put off first? 2. Which of the two candles has the shortest size? 3. What happen, when you cover the Jar A? 4. When the lighted candle in Jar A was covered, the flame was put off, what is the reason why the candle's flame did not continue to burn? 5. What are the 3 main components in combustion? Doss​

How is energy obtained by the cells when blood vessels supply cells with energy sources and substances for this growth and act as removal system for waste

Answer:

The cells obtain energy through the process of cellular respiration. Blood vessels supply cells with energy sources such as glucose, oxygen, and other nutrients that are necessary for the various metabolic processes of the cells. These substances are transported in the blood and delivered to the cells through the capillaries, which are the smallest blood vessels.

Once the glucose and other nutrients are delivered to the cells, they undergo a series of metabolic reactions that release energy that is stored in the chemical bonds of these substances. This process is called cellular respiration, and it occurs in the mitochondria of the cell.

During cellular respiration, glucose is broken down into smaller molecules through a series of chemical reactions. This process produces energy in the form of ATP (adenosine triphosphate), which is the primary energy source for the cell. Oxygen is also used in cellular respiration to help break down glucose and produce ATP.

After the energy is produced, waste products such as carbon dioxide are generated. These waste products are then transported back into the blood vessels and removed from the body through the lungs and other excretory organs. The blood vessels act as a removal system for these waste products, ensuring that they do not build up in the cells and cause harm.

Overall, blood vessels play a crucial role in supplying cells with the necessary energy sources and substances for growth and metabolic processes. They also remove waste products from the cells, ensuring that they function properly and maintain their health.

Explanation:

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