3. Bone is made of living tissue, which explains why a broken bone actually heals. To remain alive, the bone cells need blood. The bone is fed by the blood, which also removes its waste. Deep inside a compact bone are the Haversian systems, also known as circular structures. Did you know that you can actually see these systems in a cut bone? They look like the rings of a cut tree trunk. Also, bones are not as smooth as you might think. Instead, they are full of pits, rough spots, bumps, and edges. Without these spots, muscles would not be able to attach to the bone. There are also holes that allow blood vessels and nerve endings into the bone.What is the main point of paragraph 3?
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15 points
red blood cells
the skeletal system
the structure of a bone
bones, cartilage, and blood vessels
The main point of paragraph 3 is the structure of a bone.
3. Bone is made of living tissue, which explains why a broken bone actually heals. To remain alive, the bone cells need blood. The bone is fed by the blood, which also removes its waste. Deep inside a compact bone are the Haversian systems, also known as circular structures. Did you know that you can actually see these systems in a cut bone? They look like the rings of a cut tree trunk. Also, bones are not as smooth as you might think. Instead, they are full of pits, rough spots, bumps, and edges. Without these spots, muscles would not be able to attach to the bone. There are also holes that allow blood vessels and nerve endings into the bone.What is the main point of paragraph 3?
In paragraph 3, which word or words best describe Haversian systems?
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15 points
Ligament
Bone marrow
Circular structures
Cartilage