In the human body, which one of the following is anatomically correct?
Correct answer: D. Floating ribs - 2 pairs
- A. Collar bones - 3 pairs
- B. Salivary glands - 1 pair
- C. Cranial nerves - 10 pairs
- D. Floating ribs - 2 pairs
Explanation
In humans there are normally 12 pairs of ribs. The first seven pairs are attached directly to the sternum by costal cartilages and are called true ribs. The 8th, 9th, and 10th pairs-false ribs-do not join the sternum directly but are connected to the 7th rib by cartilage.There are two pairs of floating ribs and they are the most inferior of the ribs. They are different from the other ribs of the thoracic region because they do not articulate anteriorly with the sternum or the costal cartilage of other ribs. They do articulate with the thoracic vertebrae 11 and 12 posteriorly.
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Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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