Test: Skeletal & Muscular System - 2 - Class 5 MCQ

Movable joints allow bones to move smoothly because of a fluid that acts like a lubricant. This fluid helps in reducing friction between bones at the joint.

• 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 are responsible for controlling the movement in our alimentary canal by contracting and relaxing to push food along the digestive tract.
• These muscles are involuntary, meaning we do not have conscious control over them.
• Smooth muscles also play a role in other bodily functions such as regulating blood flow and helping to control breathing.
• Their smooth appearance is due to the lack of striations, unlike skeletal muscles which have a striped appearance.Involuntary or smooth muscles control the movement in our alimentary canal, the flow of blood in the blood vessels and the movement of ribs during breathing.

• The backbone is also known as the spine and is made up of 33 small bones called vertebrae.
• It protects the spinal cord, which is an essential part of the nervous system.

• 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 cartilage is not present between the joint. The bones in the skull are immovable joints.

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.

There are 27 bones in our hands and wrists.

Here's the breakdown:

• Wrist (Carpus): 8 small bones
• Palm (Metacarpus): 5 bones
• Fingers (Phalanges): 14 bones (each finger has 3 phalanges except the thumb which has 2)

The muscles of the heart are different from the other two types. These are involuntary in nature but are structurally like voluntary muscles. Cardiac muscles are present only in the heart.

Muscles work in pairs by shortening or contracting. One muscle contracts and becomes shorter whereas the other one relaxes.

The pelvic girdle connects the hind limbs to the axial skeleton. It's a ring-like structure made up of the left and right hip bones and the sacrum. The pelvic girdle is located in the lower part of the trunk and surrounds the pelvic cavity. 

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.

Voluntary or skeletal muscles help in maintaining our body posture.