Physics, chemistry, biology basics.
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Carbon dioxide is transported from tissues to the lungs.
It diffuses into alveoli and is exhaled.
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The liver is the largest internal solid organ.
It performs metabolism, detoxification, and bile production.
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Digestion breaks large food molecules into smaller units.
These nutrients can then be absorbed into blood or lymph.
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The femur is the thigh bone.
It is also one of the strongest bones.
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The small intestine has villi that greatly increase surface area.
Most digested nutrients enter blood or lymph there.
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Bones support body shape and protect organs.
They also provide attachment points for muscles.
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Roots secure the plant in soil.
Root hairs increase absorption of water and minerals.
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The large intestine absorbs remaining water and salts.
It compacts undigested material into feces.
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Tendons are strong connective tissues linking muscles to bones.
They transmit muscular force to the skeleton.
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The heart contracts rhythmically to circulate blood.
It supplies tissues with oxygen and nutrients.
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The liver produces bile.
The gallbladder stores and concentrates it.
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Ligaments stabilize joints by connecting bones.
They limit excessive movement.
