D. Answer the questions. 1. How do body cells get food and oxygen? 2. Why is it important for wastes to be carried away from cells?

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**1. How Do Body Cells Get Food and Oxygen?**

Body cells receive food and oxygen through the circulatory system. Here's how the process works:

- **Digestive System:** When you consume food, the digestive system breaks it down into essential nutrients such as glucose, amino acids, fatty acids, vitamins, and minerals.
  
- **Absorption into the Bloodstream:** These nutrients are absorbed into the bloodstream through the walls of the intestines.
  
- **Oxygen Intake:** Oxygen is inhaled into the lungs, where it passes through the alveoli (tiny air sacs) and binds to hemoglobin molecules in red blood cells.
  
- **Transportation by the Heart and Blood Vessels:** The heart pumps oxygen-rich blood and nutrient-laden blood throughout the body via arteries, delivering these vital substances to all body cells.
  
- **Cellular Uptake:** Once the blood reaches the body’s cells, oxygen and nutrients diffuse from the blood into the cells, where they are used for energy production and various metabolic processes.

**2. Why Is It Important for Wastes to Be Carried Away from Cells?**

Removing waste products from cells is crucial for several reasons:

- **Prevents Toxic Buildup:** Metabolic processes within cells produce waste products like carbon dioxide, urea, and lactic acid. If these wastes accumulate, they can become toxic and disrupt normal cellular functions.
  
- **Maintains Cellular Health:** Efficient removal of wastes ensures that cells operate in an optimal environment, maintaining pH balance and preventing harmful conditions that could lead to cell damage or death.
  
- **Supports Homeostasis:** The body's internal balance (homeostasis) relies on the continuous elimination of metabolic wastes. This balance is essential for overall health and proper functioning of organs and tissues.
  
- **Prevents Disease:** Accumulation of wastes can lead to various health issues, including kidney stones, gout, and respiratory problems due to excess carbon dioxide.
  
- **Facilitates Detoxification:** Organs like the kidneys and liver filter out and process waste products, preparing them for excretion from the body, thereby detoxifying the body and maintaining overall well-being.

In summary, the efficient delivery of nutrients and oxygen to cells, combined with the effective removal of waste products, is fundamental to maintaining healthy cell function and overall bodily health.
**1. How Do Body Cells Get Food and Oxygen?** Body cells receive food and oxygen through the circulatory system: - **Digestive System:** Food is broken down into nutrients. - **Absorption:** Nutrients and oxygen are absorbed into the bloodstream. - **Transport:** The heart pumps the oxygen-rich blood to all cells. - **Cell Uptake:** Cells take in the nutrients and oxygen for energy and metabolism. **2. Why Is It Important for Wastes to Be Carried Away from Cells?** Removing wastes is important because: - **Prevents Toxic Buildup:** Wastes can become harmful if they accumulate. - **Maintains Cellular Health:** Keeps cells functioning properly. - **Supports Homeostasis:** Helps keep the body's internal balance. - **Prevents Disease:** Avoids health issues like kidney stones and gout. - **Facilitates Detoxification:** Helps organs like the kidneys and liver clean the body. In short, removing wastes keeps cells healthy and the body functioning correctly.

D. Answer the questions. 1. How do body cells get food and oxygen? 2. Why is it important for wastes to be carried away from cells?

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