Skeletal & Muscular System - 2 - Free MCQ Practice Test with solutions,

• Cartilage is a type of elastic tissue that keeps the bones from rubbing against each other.
• It acts as a cushion between bones and absorbs shock during movement.

We have 12 pairs of ribs which form a cage around the chest, called the ribcage. The ribcage protects internal organs such as the heart and lungs.

Smooth muscles control involuntary movements such as movement in the alimentary canal and blood vessels.

The purpose of the backbone, or spine, is primarily to protect the spinal cord.

• The spinal cord is a crucial part of the nervous system.
• The backbone provides structural support to the body.
• It also allows flexibility and movement.

• Hinge joint allows movement in one direction only, like a hinge in a door.
• It is found in the elbow, knees, fingers, and toes, allowing movement in one plane.

In an immovable joint, bones are held tightly together and allow no movement, such as in the skull.

The cranium is a part of the skull that protects the brain. It is made up of eight flat bones which are interlocked together. Except for the lower jaw, all the bones of the skull are fixed.

Muscles work together in pairs. When one muscle contracts, it becomes shorter, while the other muscle relaxes and gets longer. This pair of actions allows our body to move effectively.

The pelvic girdle connects the hind limbs to the backbone.

The ball and socket joint allows the maximum movement as it has a wide range of motion. It is found in the hip and shoulder .

To have strong muscles, we should exercise regularly, play games, take proper rest and have good eating habits.

- The human backbone, or vertebral column, is made up of 33 vertebrae.
- Thus, the correct answer is Option C: 33.

There are 12 pairs of ribs in the human body. Out of these, the first 7 pairs are directly attached to the sternum (breastbone) and are called true ribs.
The next 3 pairs (8th–10th) are attached indirectly through cartilage, and the last 2 pairs (11th–12th) are not attached to the sternum at all.

Therefore, 7 pairs of ribs are directly attached to the sternum.

The primary function of the pivot joint is:
- Enabling rotational movement (B):
- Pivot joints allow one bone to rotate around another.
- A common example is the joint between the first and second cervical vertebrae in the neck, which permits the head to turn from side to side.
- This type of joint supports activities that involve twisting or turning motions, such as shaking your head "no."

D. Femur

Explanation:
The axial skeleton includes the skull, vertebral column, ribs, and sternum. The femur is part of the appendicular skeleton because it is a long bone of the lower limb.