Question

At which parts of our body can we bend?
A. Knee
B. Elbow
C. Neck
D. All of the above

Answer 1

Hint: The skeleton of the human body is formed from bones and cartilages. It forms the frame and shape of the body and helps in movement. The inner organs are protected by bones and cartilages. The alternate contractions and relaxations of two sets of muscles make the bones move. Depending upon the nature of joints and direction of movement they allow, there are different types of bone joints.

Complete answer
Option A Knee: One of the largest and most complex joints in the body is the knee. The thigh bone or femur is joined to the shin bone or tibia. The knee can be termed as a modified hinge joint which allows flexion and extension as well as slight internal and external rotation. The knee joint allows twisting of the leg and also makes walking more efficient. Since the knee can be bent, option A is the correct answer.
Option B Elbow: A hinge joint that provides great stability and movement for performing daily activities is the elbow joint. The elbow joint brings about actions like flexion, extension, supination and pronation with the help of strong muscles that extend across it, which helps to perform activities of daily life. Since the elbow can be bent, option B is also correct.
Option C Neck: Part of the body on most vertebrates, which connects head with the torso and provides mobility and movements of the head is termed as neck. The weight of the head is supported by the neck and protects the nerves which carry sensory and motor information from the brain down to the rest of the body. The neck is also highly flexible which allows the head to turn and flex in all directions. Since the neck can be bent, option C is also correct.
Option D All of the above: Since options A, B and C are correct, option D is the right answer.

Hence, Option D. All of the above is the correct answer.

Note:
When a person remains at the same place, different parts of his body move. Some of the examples are: when a person is writing in a notebook, his hand moves. Similarly, the head moves when a person turns around. Hence there are so many movements that happen in our bodies. A tremendous range of body movements is done by the synovial joints. Each movement at a synovial joint results from the contraction or relaxation of muscles which are attached to the bones on either side of articulation.