Skeletal System

Identify the three types of joints in the human body.

• Hinge, ball-and-socket, pivot

• Fixed, sliding, rotating

• Elastic, fibrous, cartilaginous

• fixed, semi-movable, movable

Answer explanation

The three types of joints in the human body are classified as fixed (immovable), semi-movable (partially movable), and movable (freely movable). This classification helps in understanding joint functionality.

How many bones does the adult human body have?

• 206

• 210

• 200

• 215

Answer explanation

The adult human body typically has 206 bones. This number can vary slightly due to anatomical variations, but 206 is the standard count recognized in human anatomy.

Which of the following bones is part of the Axial skeleton?

• Cranium

• Femur

• Tibia

• Metacarpals

Answer explanation

The cranium is part of the axial skeleton, which includes the skull, vertebral column, and rib cage. The femur, tibia, and metacarpals are part of the appendicular skeleton, which supports limbs and their attachments.

Which of the following is a function of the Axial skeleton?

• Protects the brain

• Supports the limbs

• Facilitates movement

• Stores minerals

Answer explanation

The axial skeleton, which includes the skull and vertebral column, primarily functions to protect vital organs, such as the brain. The other options relate more to the appendicular skeleton.

The human skeleton is divided into two parts: Axial skeleton and _______ skeleton.

• Appendicular

• Central

• Peripheral

• External

Answer explanation

The human skeleton consists of two main parts: the axial skeleton, which includes the skull and spine, and the appendicular skeleton, which comprises the limbs and their attachments. Therefore, the correct answer is 'Appendicular'.

What is the primary function of the ribs in the axial skeleton?

• Protect the brain

• Support the body

• Protect the heart and lungs

• Aid in movement.

Answer explanation

The primary function of the ribs is to protect vital organs, specifically the heart and lungs, by forming a protective cage around them. This is crucial for maintaining their integrity and function.

The sternum is located in the ______.

• Skull

• Chest

• Pelvis

• Leg

Answer explanation

The sternum, also known as the breastbone, is located in the chest. It is a flat bone that forms the front of the ribcage, providing protection to the heart and lungs.

The scapula is located in the ______.

• Leg

• Arm

• Skull

• Spine

Answer explanation

The scapula, also known as the shoulder blade, is located in the arm. It connects the upper arm bone to the collarbone and plays a crucial role in shoulder movement.

Which of the following is a component of the appendicular skeleton?

• Scapula

• Sternum

• Mandible

• Sacrum

Answer explanation

The scapula, or shoulder blade, is part of the appendicular skeleton, which includes the limbs and their attachments. The sternum, mandible, and sacrum are part of the axial skeleton.

Which cells are mature, living bone cells?

• Osteoblasts

• Osteoclasts

• Osteocytes

• Chondrocytes

Answer explanation

Osteocytes are mature, living bone cells that maintain bone tissue. Osteoblasts are involved in bone formation, osteoclasts in bone resorption, and chondrocytes are cartilage cells, making osteocytes the correct choice.