What is a capillary? A ting blood vessel wheve blood exchdnge substances with tissues. What is the function of red blood cells, white blood cells and platelets? How does digestion begin? Digestion stautsinu the wouth with Chboviug and saliva breakiug down food. 5. What is a reflex and what system is responsible forlreflexes? What is the function of the kidneys? Kiduecf filten blood to remove wastel regulate blood pressavel balauce

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1. **What is a capillary?**
   - A capillary is a tiny blood vessel where blood exchanges substances with tissues. Capillaries connect arterioles (small arteries) and venules (small veins) and are crucial for the delivery of oxygen and nutrients to cells and the removal of waste products.

2. **What is the function of red blood cells, white blood cells, and platelets?**
   - **Red Blood Cells (RBCs)**: Their primary function is to transport oxygen from the lungs to the body's tissues and return carbon dioxide from the tissues back to the lungs.
   - **White Blood Cells (WBCs)**: These cells are part of the immune system and help the body fight infections and other diseases. They identify and destroy pathogens and foreign substances.
   - **Platelets**: These are small cell fragments that play a crucial role in blood clotting. They help prevent bleeding by clumping together at the site of a blood vessel injury.

3. **How does digestion begin?**
   - Digestion begins in the mouth. When food is chewed, it is broken down into smaller pieces, and saliva, which contains enzymes, starts the chemical breakdown of carbohydrates. This process is essential for making food easier to swallow and digest.

4. **What is a reflex and what system is responsible for reflexes?**
   - A reflex is an automatic, involuntary response to a stimulus. The nervous system is responsible for reflexes, specifically the spinal cord and peripheral nerves, which allow for quick reactions without the need for conscious thought.

5. **What is the function of the kidneys?**
   - The kidneys filter blood to remove waste products and excess substances, regulating the body's fluid balance and electrolyte levels. They also play a role in regulating blood pressure through the control of blood volume and the secretion of hormones.

If you have any more questions or need further clarification on any topic, feel free to ask!
- **Capillary**: A tiny blood vessel where blood exchanges substances with tissues. - **Red Blood Cells**: Transport oxygen and carbon dioxide. - **White Blood Cells**: Fight infections and diseases. - **Platelets**: Help in blood clotting. - **Digestion Begins**: In the mouth, where food is broken down and saliva starts chemical breakdown. - **Reflex**: An automatic response; controlled by the nervous system. - **Kidneys**: Filter blood to remove waste, regulate fluid and electrolyte balance, and control blood pressure.

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