Problem 76 - Objective Biology for NEET

Question

Number of bones in human axial skeleton is (a) 120 (b) 142 (c) 80 (d) 206

Step-by-Step Solution

Answer

The number of bones in human axial skeleton is 80.

Step 1: Recall Basic Anatomy Knowledge

The human axial skeleton consists of 80 bones. It includes the skull, auditory ossicles, hyoid bone, spinal column, and thorax (sternum and ribs).

Step 2: Match correct information

Looking at the given options, (c) 80 matches the fact known in Step 1.

Key Concepts

Number of Bones

The human axial skeleton is an important part of our body structure. It consists of 80 distinct bones. These bones provide essential support and protection for vital areas of our body. This set of bones includes some of the most critical components:

• The Skull - 22 bones
• Auditory Ossicles - 6 tiny bones within the ear
• The Hyoid Bone - Anchors the tongue
• The Vertebral Column - 33 vertebrae
• The Thorax (including Sternum and Ribs) - 25 bones

The combination of these bones forms a rigid framework that supports the body and allows us to stay upright. Understanding these numbers is key not only for academic purposes but also for gaining insight into human anatomy. Knowing that the axial skeleton includes 80 bones can help in identifying disorders and understanding how disruptions in this area can impact our health.

Basic Anatomy

The axial skeleton is one of the two main divisions of the human skeletal system, the other being the appendicular skeleton. It consists mainly of the bones that run along the center of the body. While its primary role is to provide structural support and protection, it also plays a part in movement and stability.

Components of the Axial Skeleton

The main components include:

• The Skull: Protects the brain and supports the structures of the face.
• Auditory Ossicles: Small bones that transmit sound from the outer ear to the inner ear.
• Hyoid Bone: Serves as an anchor for the tongue, playing a crucial role in swallowing and speech.
• Vertebral Column: Protects the spinal cord and supports the head and upper body.
• The Thorax: Includes the sternum and rib cage, which protect the heart and lungs.

Each of these components has a specific role, all contributing to protecting the body's core and its vital organs.

Skeletal System

The skeletal system of the human body is divided into two major parts: the axial skeleton and the appendicular skeleton. Together, they perform several critical functions that are vital for our survival and well-being.

Functions of the Skeletal System

The skeletal system provides:

• Support: Forms the framework that supports the body.
• Protection: Shields vital organs, such as the brain, heart, and lungs.
• Movement: Works with muscles to facilitate movement.
• Mineral Storage: Stores minerals, like calcium and phosphorus, essential for strength and metabolic functions.
• Blood Cell Production: Red and white blood cells and platelets are produced in the bone marrow.

The axial skeleton, being a part of this system, is crucial for holding the body's weight, bearing forces that occur during movement, and protecting the central nervous system and thoracic organs. Understanding the skeletal system helps us appreciate how our bodies work and highlights the importance of bone health in overall well-being.