The growth patterns of cartilage include interstitial growth (from within) and ________ growth (from without).
Fill in the blank(s) with the appropriate word(s).
appositional
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During early embryonic development, a protein called sonic hedgehog is released from a cell and travels in a small gradient through the interstitial fluid only to nearby cells. This helps to establish the path and direction of development for the nervous system and limbs. Knowing this, sonic hedgehog must be a(n) ________ signal.
A. nervous B. endocrine C. autocrine D. paracrine
The adult spinal cord ends between the level L1 and L2 of the vertebral column
Indicate whether the statement is true or false
Cows with horns should be placed so the horn is behind the handler
Indicate whether the statement is true or false
Which disorder affects an accessory organ of the digestive system?
A. Gastroenteritis B. Colon cancer C. Hepatitis D. Dental caries