Question

Which of the following match is incorrect?
A. 8^th, 9^th, and 10^th pairs of ribs - Do not articulate directly with the sternum but join the sixth rib with the help of hyaline cartilage.
B. Glenoid cavity - Articulates with the head of the humerus to form the shoulder joint.
C. Fibrous joint - Flat skull bones that fuse end-to-end with the help of dense fibrous connective tissues in the form of sutures to form the cranium.
D. Increase in Ca⁺⁺ level - Leads to the binding of calcium with a subunit of troponin on actin filaments and thereby removes the masking of active sites for myosin.

Answer 1

Hint:
Bones are made up of connective tissue. Bones provide the structure of our body. The adult human body contains 206 bones. Bones coordinate with muscles and joints to hold the body together as well as the movement of the body

Complete answer:
Bones coordinate with muscles and joints to hold the body together as well as the movement of the body. The human thoracic cage consists of 12 pairs of ribs. The first 7^th ribs are dorsally attached to the thoracic vertebrae and ventrally attached to the sternum with the hyaline cartilage. These first 7^th ribs are known as true ribs.
The 8^th,9^th, and 10^th pair are known as false ribs as they are not connected to the sternum or breastbone. These 8^th, 9^th, and 10^th pairs of ribs are attached to the 7^th pair of ribs with the help of hyaline cartilage.
Hence the correct answer is 8^th, 9^th, and 10^th pairs of ribs - Do not articulate directly with the sternum but join the sixth rib with the help of hyaline cartilage

Option ‘A’ is correct

Note:
The 11^th and 12^th pairs of ribs are known as floating ribs as they are not connected ventrally.