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Mekdes Beyene
Anatomy Unit 3
| Question | Answer |
|---|---|
| What are atoms? | Atoms are the smallest units of matter that retain the properties of an element. |
| What are the main parts of an atom? | Protons (positive charge), neutrons (no charge), and electrons (negative charge). |
| What is matter? | Matter is anything that has mass and takes up space; it’s made of atoms. |
| What is a molecule? | A molecule forms when two or more atoms bond together (e.g., H₂O). |
| What are the four main elements in the human body? | Oxygen, carbon, hydrogen, and nitrogen. |
| What is a chemical bond? | A force that holds atoms together; examples include ionic and covalent bonds. |
| What is an ionic bond? | A bond formed when one atom donates an electron to another (e.g., NaCl) |
| What is a covalent bond? | A bond formed when atoms share electrons. |
| Why is water important to life? | It’s essential for chemical reactions, temperature regulation, and transport of substances. |
| What are the four major organic molecules in the body? | Carbohydrates, lipids, proteins, and nucleic acids. |
| What is the role of enzymes? | Enzymes speed up chemical reactions in the body without being used up |
| What is pH? | A measure of how acidic or basic a solution is; the body’s normal pH is around 7.4. |
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Twin0324