6th Grade Human Body Quiz | 20 Questions with Answers Grade 6
Free 6th Grade Human Body Quiz! 20 NGSS questions: brain (nervous), red blood cells (oxygen), skeletal (206 bones), diaphragm breathing, nephrons (kidneys). Middle school USA anatomy!
Grade 6 Human Body Systems Practice Questions with Answers
Grade 6 human body quiz: brain control center, hemoglobin oxygen transport, 206 bones support, diaphragm inhalation, 1M nephrons/kidney filter blood. 20 NGSS anatomy questions + explanations!
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Join WhatsApp Channel Follow on Facebook20 Grade 6 human body systems questions for US middle school students. NGSS MS-LS1 aligned. 70% (14/20) to PASS!
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Outstanding human anatomy knowledge, Grade 6 student!
You’ve mastered body systems from circulatory to skeletal with detailed understanding.
Perfect NGSS MS-LS1 preparation for middle school science success!
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Excellent anatomy review practice!
Human body systems connect through diagrams and function memorization.
Study detailed explanations — you’ll master Grade 6 biology next time!
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#1. Which part of eye focuses light onto retina?
Explanation: Crystalline lens changes shape (accommodation) for near/far vision.
#2. Which bone protects brain?
Explanation: 8 cranial + 14 facial = 22 skull bones. Sutures fuse tightly.
#3. What hormone regulates blood sugar levels?
Explanation: Pancreas produces insulin (lowers glucose by cells uptake); diabetes = insulin deficiency.
#4. Which blood vessels carry oxygen-rich blood from heart?
Explanation: Thick elastic walls withstand pressure. Aorta = largest artery (~1″ diameter).
#5. What muscle separates chest from abdomen and aids breathing?
Explanation: Dome-shaped; contracts (flattens) → inhale, relaxes (domes) → exhale. Controls ~70% breathing volume.
#6. What connects muscle to bone for movement?
Explanation: Tough collagen cords. ~650 muscles attach via tendons; injuries cause strains.
#7. Which system regulates body temperature, growth, metabolism?
Explanation: Glands secrete hormones into bloodstream (slower than nerves).
#8. Which gland controls other glands as “master gland”?
Explanation: Anterior produces growth hormone; posterior stores ADH/oxytocin.
#9. What structure lines digestive tract and absorbs nutrients?
Explanation: Villi/microvilli increase surface area (tennis court size). Enzymes complete digestion; duodenum receives bile/pancreatic juice.
#10. What type of joint is the knee?
Explanation: Allows flexion/extension only (one plane movement).
#11. Which organ filters blood and produces urine?
Explanation: Nephrons (1 million/kidney) filter ~180 liters blood daily. Removes urea, excess water, toxins. Regulates blood pressure/electrolytes.
#12. What prevents food entering windpipe?
Explanation: Flap covers trachea during swallowing.
#13. Which system provides support and protection for organs?
Explanation: 206 bones in adults. Compact/spongy bone; cartilage at joints. Produces blood cells (marrow); stores calcium/minerals.
#14. How many chambers in human heart?
Explanation: 2 atria (receive), 2 ventricles (pump). Right side → lungs; left → body.
#15. How many pairs of spinal nerves in humans?
Explanation: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal. Connect to spinal cord.
#16. Which organ is the control center of the nervous system?
Explanation: Brain weighs ~3 lbs, contains ~86 billion neurons. Cerebrum (thinking), cerebellum (balance), brainstem (vital functions). Protected by skull + meninges + cerebrospinal fluid.
#17. Which system fights infection using white blood cells?
Explanation: Lymph nodes filter pathogens; lymphocytes (B/T cells) produce antibodies. Spleen stores blood/filters old RBCs.
#18. What carries nerve impulses from brain to muscles?
Explanation: ~100 billion neurons; myelinated axons speed signals (up to 268 mph).
#19. What carries oxygen in blood to body tissues?
Explanation: Red blood cells (erythrocytes) contain hemoglobin (iron protein) binding O₂. Produced in bone marrow; live ~120 days; 5 million/mm³ blood.
#20. What covers and protects entire body as largest organ?
Explanation: Epidermis/dermis layers. Epidermis waterproof keratin; dermis sensory/hair glands.
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