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Ahmad RAdwan 2

2025-3-SCI221-04 1 to 6

QuestionAnswer
1. What is homeostasis? Homeostasis is the body’s ability to keep a stable internal environment, like steady temperature and blood pressure.
2. Which two systems mainly help maintain homeostasis? The nervous and endocrine systems.
3. What are the four main biomolecules in the body? Carbohydrates, lipids, proteins, and nucleic acids.
4. What is the main function of enzymes? Enzymes speed up chemical reactions in the body.
5. What is the main control center of the cell? The nucleus, because it holds DNA and controls cell activities.
6. What is mitosis used for? Mitosis helps cells grow and repair by making two identical daughter cells.
7. What are the four main types of body tissues? Epithelial, connective, muscle, and nervous tissue.
8. What is the function of the skeletal system? It supports the body, protects organs, and allows movement with muscles.
9. What connects bones to muscles? Tendons connect muscles to bones.
10. What chemical is needed for muscles to contract? Calcium (Ca²⁺) is needed for muscle contraction.
Created by: user-1988541
 

 



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