1. Primary role of the Circulatory System?
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A) Facilitates breathing
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B) Transports oxygen and nutrients
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C) Breaks down food
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D) Enables movement
Answer: B) Transports oxygen and nutrients
2. Which system is responsible for the exchange of oxygen and carbon dioxide in the body?
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A) Digestive System
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B) Respiratory System
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C) Muscular System
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D) Skeletal System
Answer: B) Respiratory System
3. What is the main role of the Digestive System?
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A) Regulates hormones
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B) Enables movement
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C)Produce nutrients by breaking down food
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D) Provides structural support
Answer: C) Produce nutrients by breaking down food
4. Which system facilitates bodily functions, supports posture, and enables movement?
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A) Respiratory System
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B) Nervous System
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C) Muscular System
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D) Endocrine System
Answer: C) Muscular System
5. The Skeletal System serves as a reservoir for:
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A) Oxygen
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B) Nutrients
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C) Minerals
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D) Hormones
Answer: C) Minerals
6. What is the role of the Nervous System in the body?
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A) Breaks down food
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B) Regulates hormones
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C) Controls and coordinates bodily functions
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D) Defends against pathogens
Answer: C) Controls and coordinates bodily functions
7. The Endocrine System regulates hormones that control:
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A) Breathing
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B) Metabolism, growth, and development
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C) Digestion
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D) Movement
Answer: B) Metabolism, growth, and development
8. Which system defends the body against pathogens and foreign substances?
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A) Respiratory System
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B) Immune System
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C) Circulatory System
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D) Urinary System
Answer: B) Immune System
9. What is the role of the Urinary System?
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A) Regulates fluid balance
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B) Breaks down food
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C) Enables movement
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D) Facilitates reproduction
Answer: A) Regulates fluid balance
10. The Reproductive System facilitates:
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A) Circulation of blood
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B) Breakdown of nutrients
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C) Movement and posture
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D) Reproduction and hormonal regulation
Answer: D) Reproduction and hormonal regulation
11. What are the basic structural and functional units of the body?
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A) Organs
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B) Tissues
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C) Cells
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D) Systems
Answer: C) Cells
12. Which system is responsible for the exchange of oxygen and nutrients throughout the body?
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A) Circulatory System
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B) Respiratory System
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C) Nervous System
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D) Skeletal System
Answer: A) Circulatory System
13. What is the primary function of cellular respiration?
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A) Production of DNA
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B) Conversion of nutrients into energy (ATP)
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C) Synthesis of proteins
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D) Transport of oxygen
Answer: B) Conversion of nutrients into energy (ATP)
14. Which organ is responsible for generating about 20 watts of electrical power in the human body?
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A) Heart
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B) Liver
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C) Brain
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D) Lungs
Answer: C) Brain
15. How many bones make up the adult human skeletal system?
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A) 100
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B) 150
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C) 206
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D) 300
Answer: C) 206
16. What is the extensive network in the human body that, if stretched, would circumvent the Earth approximately four times?
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A) Nervous System
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B) Respiratory System
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C) Digestive System
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D) Blood vessels
Answer: D) Blood vessels
17. How much blood does the human heart pump daily?
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A) 5,000 liters
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B) 7,200 liters
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C) 10,000 liters
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D) 15,000 liters
Answer: B) 7,200 liters
18. What is the largest organ in the human body, serving as a protective barrier against external threats?
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A) Liver
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B) Brain
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C) Skin
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D) Heart
Answer: C) Skin
19. What is the lifespan of taste buds on the tongue?
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A) 5-7 days
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B) 10-14 days
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C) 20-30 days
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D) 1 month
Answer: B) 10-14 days
20. What percentage of DNA do humans share with chimpanzees?
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A) 80%
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B) 90%
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C) 95%
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D) 98%
Answer: D) 98%