Question

Haversian canal occurs in:
A) Cartilage
B) Bone
C) Internal Ear
D) Liver

Answer 1

Hint: Haversian canal is a minute tube like structure that may form a network and it is said to be containing blood vessels. It is required for the supply of oxygen and nutrition where there is no high vascular presence. It is also called the canals of Havers. They were first described by Captain Havers, a British physician.

Complete Answer:
Cartilage and bone are the connective tissues of the Human skeletal system. Cartilage is solid, flexible tissue that resists compression whereas bone is hard, rigid and has calcium. Internal structure of the ear or inner ear consists of a bony labyrinth and membranous labyrinth. Liver is the part of the digestive system that produces enzymes that are required for the process of digestion.
There are two types of bones based on structure, spongy bone and compact bone. The fibrous tissue sheath present in the outer layer of compact bone is called periosteum and the inner layer consists of endosteum. In between these two, there is lamelle, outer beneath the periosteum and then the inner circumferential lamellae.
Between the outer and inner circumferential lamellae, there is the microscopic tube-like structures called Haversian Canal. It runs parallel to the marrow cavity. The Haversian canal consists of an artery, a vein and a lymph vessel. The main function of these canals is to supply oxygen and some nutrients to the osteocytes. Osteocytes are the cells of bone.

Hence, the correct answer is option B) Bone.

Note:
Haversian canals communicate with one another and periosteum. They are said to be wider in patients suffering from Rheumatoid arthritis. They may also be damaged by injuries to the bone, or any type of bone fracture. The haversian canals, surrounded by lamelle together from the Haversian system.