Dense regular connective tissue is present in _________.
A. Ligament and tendon
B. The joint capsule and Wharton’s jelly
C. Periosteum and endosteum
D. Pericardium and heart valves

Hint: The dense regular connective tissue consists of collagen fibers that are arranged in parallel rows. These fibers are densely packed and are resistant to axial load. These tissues help in muscle and bone attachment.

Complete step by step answer: The dense regular connective tissue is composed of collagen fibers that are arranged in parallel. These are dense and are resistant to axial tension and provide some stretch where they are present. These are normally present in between bones, and muscles.
-The ligament acts as a connective tissue that connects two bones. The tendon is also a connective tissue that connects bones or cartilage to the muscles. These are dense regular connective tissue and are present in between bones and muscles.
-The joint capsule is an envelope-like membrane that surrounds synovial joints. The Wharton’s jelly is a gelatinous substance that is present in umbilical cords and consists of some fibroblasts. These are not dense regular connective tissue.
-The periosteum and endosteum are bone coverings. The periosteum covers bone externally and the endosteum covers the bone internally. These are not connective tissues and have no stretch capacity.
-The pericardium is a double-walled sac that encloses the heart in it. It provides stretch but no resistance to axial load from external stimulus. The heart wall is thin paper-like flaps that differentiate the chamber flow in the heart. Both of these are not composed of dense regular connective tissue.
Thus, the right answer is option A, i.e., ligament, and tendon.

Note: The ligaments and tendons are densely packed and thus function as tension resistant tissues. To some degree, they also provide stretch due to which we move our joints.