Skeletal System - Biology

What is the primary function of the skeletal system?

• To produce blood cells
• To protect internal organs
• To control muscles
• To regulate body temperature
• To store fat

Answer explanation

The skeletal system provides structure and protects internal organs.

How many bones are in the human skeleton?

• 80
• 126
• 206
• 102
• 150

Answer explanation

There are 206 bones in the adult human skeleton.

Which type of bone tissue is denser and stronger?

• Spongy bone
• Compact bone
• Cartilage
• Yellow marrow
• Red marrow

Answer explanation

Compact bone is denser and found in the outer layer of bones.

What is the main component of bone tissue?

• Calcium phosphate
• Sodium chloride
• Potassium
• Magnesium
• Zinc

Answer explanation

Bone tissue is primarily made up of calcium phosphate.

Which part of the skeleton protects the brain?

• Vertebrae
• Sternum
• Skull
• Ribs
• Femur

Answer explanation

The skull protects the brain.

What is the axial skeleton composed of?

• Arms and legs
• Skull, vertebral column, ribs, and sternum
• Skull, arms, and pelvis
• Legs and arms
• Pelvis and sternum

Answer explanation

The axial skeleton includes the skull, vertebral column, ribs, and sternum.

What is found in the spaces of spongy bone?

• Yellow marrow
• Red marrow
• Cartilage
• Blood vessels
• Nerves

Answer explanation

Red marrow, which produces blood cells, is found in spongy bone.

What is the function of ligaments?

• To connect bones
• To connect muscles
• To produce blood cells
• To store fat
• To produce energy

Answer explanation

Ligaments connect bones to each other.

Which type of joint allows rotational movement?

• Ball and socket
• Hinge
• Pivot
• Gliding
• Suture

Answer explanation

A pivot joint allows rotational movement, such as in the neck.

Which joint allows the greatest range of movement?

• Hinge
• Pivot
• Ball and socket
• Gliding
• Suture

Answer explanation

Ball-and-socket joints, such as in the shoulders and hips, allow the greatest range of movement.