Q. 1. What is cavity in bone ?
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Q. 2. The arm rotates at specific site of the body. Nam
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Q. 3. What are cartilage ?
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Q. 4. Write differences between voluntary and involuntary movements.
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Q. 5. How is a bird's body adapted for flying ? Give any two adaptations ?
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Answer:
1.
2.The medullary cavity (medulla, innermost part) is the central cavity of bone shafts where red bone marrow and/or yellow bone marrow (adipose tissue) is stored; hence, the medullary cavity is also known as the marrow cavity
3.Cartilage is an important structural component of the body. It is a firm tissue but is softer and much more flexible than bone. Cartilage is a connective tissue found in many areas of the body including: Joints between bones e.g. the elbows, knees and ankles. Ends of the ribs.
4.Voluntary muscle is under conscious control, and thus is controlled by the somatic nervous system while the involuntary muscle is under unconscious control, controlled by the autonomic nervous system. ... The structure of voluntary and involuntary muscles matches their functions in the human body.
5.Bird's body is spindle shaped which provide less resistance while flying or during swimming as in case of penguins. Bird's volume of the body is increased by presence of feathers compared to the weight. Fore limbs are modified into wings for aerial locomotion.
Answer:
hollow space in the bone .
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