31.
There are 12 pairs of curved bones called X In our chest region. One end of
bones X Is joined to backbone and their othe end is joined to bone Y In the
front to form to box-like structures Z, this strong, box like structures protects
the delicate internal organs P.Q and R of our body.
a) What are (1) X (II) Y, and (iii) Z
b) Name the (1) P (II) Q, and (iii) R
Answers
Answer:
X: Ribs
Y: Sternum
Z: Rib cage
P: Heart
Q: Lungs
R: Liver
Explanation:
Ribs:The thoracic cage (rib cage) forms the thorax (chest) portion of the body. It consists of the 12 pairs of ribs with their costal cartilages and the sternum (Figure 1). The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1–T12). The thoracic cage protects the heart and lungs.
Sternum:The sternum is a long, flat bone that forms the front of the rib cage. The cartilages of the top seven ribs (the true ribs) join with the sternum at the sternocostal joints. The costal cartilage of the second rib articulates with the sternum at the sternal angle making it easy to locate.
Rib cage:The rib cage is the arrangement of ribs attached to the vertebral column and sternum in the thorax of most vertebrates, that encloses and protects the heart and lungs.
Flexible yet strong, the rib cage protects major vital organs such as the heart, lungs, and liver. Contrary to urban legend and some religious beliefs, women do not have more ribs than men. A typical rib cage has 24 ribs. Each rib extends from the spinal cord and wraps around the body in a semicircle.
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Answer:
It consists of the 12 pairs of ribs with their costal cartilages and the sternum (Figure 1). The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1–T12). The thoracic cage protects the heart and lungs. Sternum:The sternum is a long, flat bone that forms the front of the rib cage