Human Body Systems Flashcards
Grade 6 · Science · Flashcards
Review the major organ systems, their organs, and their functions.
Flashcards
- Organ system
- A group of organs working together to perform a major body function.
- Digestive system
- Breaks down food into usable nutrients; includes mouth, esophagus, stomach, intestines, and liver.
- Circulatory system
- Pumps blood via the heart through arteries and veins to deliver oxygen and remove waste.
- Respiratory system
- Brings oxygen in and expels carbon dioxide through the lungs and breathing.
- Skeletal system
- 206 bones that give the body structure, protect organs, and allow movement.
- Muscular system
- Muscles that contract to move bones and power body functions like heartbeat and breathing.
- Nervous system
- Brain, spinal cord, and nerves that control and coordinate all body activities.
- Alveoli
- Microscopic air sacs in the lungs where oxygen enters the blood and CO2 exits.
- Arteries
- Blood vessels that carry oxygenated blood away from the heart.
- Veins
- Blood vessels that return blood to the heart.
- Capillaries
- The smallest blood vessels where nutrient and gas exchange with cells occurs.
- Small intestine
- The organ (about 6 m long) where most digestion and nutrient absorption takes place.
- Diaphragm
- The dome-shaped muscle below the lungs that contracts to cause breathing.
- Liver
- A digestive organ that produces bile, detoxifies blood, and stores glycogen.
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