Check your understanding of concepts from 20·1–20·6 Animal body structures reflect their functions by answering the following questions.
1. What level of biological organization comes just above the cellular level (e.g. what level is immediately above the cellular level in complexity)?
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2. One of the main functions of blood is to:
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3. The human muscular system is extremely complex with more than 600 different types of skeletal muscles cells alone. Which of the following attributes is a common feature to all of these different types of skeletal muscle cells?
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4. Neurons generally have all of the following components except:
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5. ______________ glands secrete products like earwax and sweat, while ____________ glands produce hormones.
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