Cartilage is NOT found in
- A.larynx
- B.nose
- C.ear
- D.urinary bladder
Correct answer
Explanation
The correct answer is D, urinary bladder. The urinary bladder is a hollow muscular sac made of smooth muscle and a stretchable lining; it has no cartilage.
Cartilage is a firm but flexible connective tissue. Its cells, called chondrocytes, lie in a matrix of protein and sugar, and it has no blood vessels of its own. It gives shape and support where some flexibility is needed: the external ear, the tip of the nose, the larynx and trachea, the ends of long bones at joints and the discs between vertebrae. The bladder, by contrast, must expand and shrink as it fills with and empties urine, so its wall is made of smooth muscle called the detrusor and a special lining called transitional epithelium.
A is wrong because the larynx is built of cartilages such as the thyroid cartilage, which forms the Adam's apple. B is wrong because the tip and septum of the nose are supported by cartilage. C is wrong because the outer ear, the pinna, is made of elastic cartilage.
Exam tip: pinna, nose tip, larynx and trachea have cartilage; the bladder has smooth muscle instead.
Practice Questions
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- A.Thomas Savery
- B.Thomas Newcomen
- C.James Watt
- D.Richard Arkwright
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- A.20 Ω
- B.10 Ω
- C.5 Ω
- D.15 Ω
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- A.nearby object is focused beyond the retina.
- B.nearby object is focused before the retina.
- C.distant object is focused before the retina.
- D.distant object is focused beyond the retina.
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- A.By filtration
- B.By evaporation
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- D.By condensation
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- A.motor
- B.generator
- C.ammeter
- D.galvanometer
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