Understanding the Human Skeleton

What is one of the primary functions of the human skeleton?

• To produce hormones

• To provide structural support

• To regulate body temperature

• To digest food

Answer explanation

One of the primary functions of the human skeleton is to provide structural support, allowing the body to maintain its shape and protect vital organs. The other options do not accurately describe a main function of the skeleton.

Which of the following factors affects joint stability the most?

• The length of the bones

• The strength of the surrounding muscles

• The colour of the cartilage

• The temperature of the joint

Answer explanation

The strength of the surrounding muscles is crucial for joint stability, as strong muscles provide support and control, reducing the risk of dislocation or injury. Other factors like bone length and cartilage color have less impact.

What is the primary component of bone structure?

• Collagen

• Keratin

• Elastin

• Myosin

Answer explanation

Collagen is the primary component of bone structure, providing strength and flexibility. It forms a scaffold that supports the mineral content of bones, making it essential for their integrity and function.

Which type of joint is characterised by a fluid-filled cavity?

• Fibrous joint

• Cartilaginous joint

• Synovial joint

• Fixed joint

Answer explanation

A synovial joint is characterized by a fluid-filled cavity called the synovial cavity, which allows for smooth movement between the articulating bones. This distinguishes it from fibrous and cartilaginous joints, which lack this feature.

Which plane of movement divides the body into left and right halves?

• Frontal plane

• Sagittal plane

• Transverse plane

• Coronal plane

Answer explanation

The sagittal plane divides the body into left and right halves. In contrast, the frontal plane divides it into front and back, while the transverse plane separates it into upper and lower parts.

What type of movement is possible at a hinge joint?

• Rotation

• Flexion and extension

• Abduction and adduction

• Circumduction

Answer explanation

A hinge joint allows movement primarily in one plane, enabling flexion and extension. This is seen in joints like the elbow and knee, where the angle between bones decreases or increases.

Which of the following is NOT a function of the skeleton?

• Protection of internal organs

• Production of red blood cells

• Storage of minerals

• Production of digestive enzymes

Answer explanation

The skeleton functions in protection of organs, production of red blood cells, and storage of minerals. However, it does not produce digestive enzymes, which are made by the pancreas and other organs.

What is the role of synovial fluid in synovial joints?

• To provide nutrients to the joint

• To act as a lubricant

• To strengthen the joint

• To connect bones

Answer explanation

Synovial fluid primarily acts as a lubricant in synovial joints, reducing friction between the articular cartilage of the bones during movement. This lubrication is essential for smooth joint function.

Which movement occurs in the transverse plane?

• Flexion

• Extension

• Rotation

• Abduction

Answer explanation

Rotation is the movement that occurs in the transverse plane, allowing for twisting motions around the body's axis. Flexion, extension, and abduction occur in different planes, making rotation the correct choice.

What is the primary mineral stored in bones?

• Sodium

• Calcium

• Potassium

• Iron

Answer explanation

The primary mineral stored in bones is calcium, which is essential for bone strength and structure. Other minerals like sodium, potassium, and iron are present in the body but are not the main components of bone tissue.