Human Body Systems 6th Grade

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Across
  1. 1. Primary site for chemical digestion and nutrient absorption, featuring dense finger-like villi.
  2. 5. Muscular duct that transports filtered urine via peristalsis from the renal pelvis to the urinary bladder.
  3. 9. Fan-shaped muscle on the side of the skull that elevates and retracts the mandible.
  4. 11. Digestive organ responsible for reabsorbing water and electrolytes while consolidating indigestible waste into feces.
  5. 13. Paired vertical abdominal muscle that flexes the lumbar spine.
  6. 20. Two-headed neck muscle that flexes the neck and rotates the head side to side.
  7. 23. Four-headed anterior thigh muscle group responsible for extending the leg at the knee joint.
  8. 26. Anterior lower leg muscle responsible for dorsiflexing and inverting the foot.
  9. 28. Superficial two-headed calf muscle responsible for plantarflexing the foot at the ankle joint.
  10. 29. Longest strap muscle in the human body, running obliquely across the anterior thigh to flex and rotate the hip and knee.
  11. 30. Microscopic functional filtering unit of the kidney responsible for ultrafiltration and selective reabsorption.
  12. 32. Upper arm bone articulating with the scapula at the shoulder and the radius and ulna at the elbow.
  13. 35. Low-pressure vessel equipped with internal one-way valves to prevent backflow as blood returns to the heart.
  14. 36. Longest, heaviest, and strongest bone in the human skeleton, forming the thigh.
  15. 37. Anucleated cell fragment originating from megakaryocytes that initiates blood clotting at damaged vessel sites.
  16. 40. J-shaped digestive organ that uses hydrochloric acid and pepsin to churn food into acidic chyme.
  17. 42. Division of the nervous system consisting of all nerves branching out from the central brain and spinal cord.
  18. 43. Lateral bone of the forearm that rotates over the ulna to allow pronation and supination.
  19. 44. Tough band of fibrous connective tissue that anchors skeletal muscle securely to bone.
  20. 46. Microscopic junction across which neurochemical signals diffuse from one neuron to a target cell.
  21. 48. Four-chambered muscular pump that drives systemic and pulmonary circulation.
  22. 50. Cartilaginous voice box housing the vocal cords, positioned superior to the trachea.
  23. 51. Detectable change in the internal or external environment that triggers a sensory response.
  24. 53. Largest internal organ responsible for metabolic detoxification, glycogen storage, and bile synthesis.
  25. 54. Powerful muscle of mastication that elevates the mandible to exert force during chewing.
  26. 55. Lateral abdominal wall muscle that assists in trunk rotation and lateral flexion.
Down
  1. 1. Striated muscle tissue attached to bones that operates under conscious, voluntary control.
  2. 2. Bony structure of the skull that encapsulates and protects the brain.
  3. 3. Anucleated biconcave disc cell packed with iron-containing hemoglobin specialized for oxygen transport.
  4. 4. Bitter greenish-yellow alkaline fluid produced by liver cells to emulsify dietary fats.
  5. 6. Medial bone of the forearm featuring the olecranon process that forms the point of the elbow.
  6. 7. Thick-walled, elastic vessel engineered to transport oxygenated blood away from the heart under high pressure.
  7. 8. Thick triangular shoulder muscle responsible for abducting the arm at the shoulder joint.
  8. 10. Circular sphincter muscle encircling the eye orbit that closes the eyelids during winking or blinking.
  9. 12. Hollow, distensible muscular sac in the pelvis that stores urine prior to excretion.
  10. 14. Two-headed anterior upper arm muscle that flexes the elbow joint.
  11. 15. Dual exocrine and endocrine organ secreting digestive enzymes into the duodenum and insulin into the bloodstream.
  12. 16. Terminal canal through which urine is excreted from the urinary bladder to the body exterior.
  13. 17. Largest and heaviest muscle in the human body, serving as the primary extensor of the hip.
  14. 18. Microscopic, single-celled wall vessel where gas exchange and nutrient diffusion occur with tissue cells.
  15. 19. S-shaped collarbone linking the sternum to the scapula.
  16. 21. Specialized cell that transmits rapid electrochemical signals using dendrites, an axon, and synaptic terminals.
  17. 22. Three-headed posterior upper arm muscle that extends the forearm at the elbow.
  18. 24. Retroperitoneal organ containing renal nephrons that filter cellular waste from blood to form urine.
  19. 25. Dome-shaped skeletal muscle separating the thoracic and abdominal cavities that pulls downward during inhalation.
  20. 27. Dense fibrous connective tissue band that connects bone to bone across a joint.
  21. 31. Immune defender cell responsible for phagocytosis and patrolling the bloodstream for pathogens.
  22. 33. Large flat triangular shoulder blade that articulates with the humerus and clavicle.
  23. 34. Largest sesamoid bone in the body, embedded in the quadriceps tendon to protect the knee joint.
  24. 38. Flap of elastic cartilage that folds over the trachea during swallowing to prevent aspiration.
  25. 39. Flat, dagger-shaped breastbone situated at the center of the chest anchored to the true ribs.
  26. 41. Involuntary striated muscle tissue containing intercalated discs found exclusively within heart walls.
  27. 42. Straw-colored fluid matrix comprising about 55% of blood volume, carrying proteins, electrolytes, and dissolved nutrients.
  28. 45. Muscular tube that propels swallowed food boluses toward the stomach using wave-like peristaltic contractions.
  29. 47. Large anterior chest muscle that adducts, flexes, and medially rotates the humerus.
  30. 49. Non-striated involuntary muscle tissue found in the walls of hollow internal organs like intestines and blood vessels.
  31. 52. Cartilage-ringed windpipe extending from the larynx to the primary bronchi.