Question

Cavity into which the head of the longest and strongest bone of the human body fits is
A) Glenoid
B) Clavicular
C) Obturator foramen
D) Acetabulum

Answer 1

Femur is the longest bone of the human body. It is also called the thigh bone and it supports the weight of the body on the leg. It is the strongest bone extending from the hip to the knee. It provides support for walking.

Complete answer:
The point where 2 bones meet is called a joint or the point of articulation. Joints allow the bones to move. Various types of joints in humans are- ball and socket joint, gliding joint, saddle joint, pivot joint etc.
Let us look at each of the given options.
A) Glenoid- Glenoid cavity is part of the pectoral girdle. It is present below the acromion in the form of a depression at the lateral surface of the scapula. It articulates with the head of humerus bone forming the shoulder joint.
B) Clavicular- Clavicle is a long s-shaped bone forming the anterior part of the pectoral girdle. It is also called the collar bone. On one side it articulates with the sternum and on another side with the acromion.
C) Obturator foramen- it is the large opening between the ischium and pubis bone of the pelvic girdle. It is round or oval, filled with the lining of connective tissue and serve as an attachment site for muscles.
D) Acetabulum- Ilium, ischium and pubis bones fuse and form a cavity which is called the acetabulum. It acts as the attachment site for the longest and strongest bone of the body which is the thigh bone or femur.

Hence, the correct answer is option D.

Note: Pelvic girdle is a part of the appendicular skeleton and it connects the lower limbs to the axial skeleton. It is formed by a pair of coxal bone (hip bone), which is made up of the fusion of three bones- ilium, ischium and pubis.