7.1 Human Skeleton

Support in living organisms is necessary to uphold and sustain the body against gravity and other external forces. As living organisms have increased in size through the process of evolution, the need for support became greater. This was particularly true once living organisms left water and colonized land. The skeleton in animals contributes to this support.

Definition

Human Skeleton: Human skeletal system consists of bones and cartilage. The skeleton acts as a framework that supports soft tissues. It allows free movement through the action of muscles across joints.

Osteology: The study of bones and cartilage is called osteology.

Main Idea

• Support is necessary to uphold and sustain the body against gravity.
• Need for support increased as organisms grew larger.
• Need for support increased when organisms colonized land.
• The skeleton contributes to this support.
• Human skeletal system consists of bones and cartilage.
• The skeleton acts as a framework that supports soft tissues.
• It allows free movement through the action of muscles across joints.
• The study of bones and cartilage is called osteology.

Core Concept

• Skeleton = bones and cartilage
• Framework = supports soft tissues
• Movement = muscles act across joints
• Osteology = study of bones and cartilage
• Support = against gravity and external forces
• Evolution = increased need for support with size and land colonization

Detailed Explanation

Human Skeleton

• Support in living organisms is necessary to uphold and sustain the body against gravity and other external forces.
• As the living organisms have been increased in size through the process of evolution, the need for support became greater.
• This was particularly true once living organisms left water and colonized land.
• The skeleton in animals contributes to this support.
• Human skeletal system consists of bones and cartilage.
• The skeleton acts as a framework that supports soft tissues.
• It allows free movement through the action of muscles across joints.
• The study of bones and cartilage is called osteology.

Intermediate Level

Human Skeleton

Need for Support

Formula / Mathematical Form

Not applicable to this topic.

Solved Example

Not applicable to this topic (descriptive topic).

Important Points

• 1. Support is necessary for living organisms.
• 2. Support upholds the body against gravity.
• 3. Support sustains the body against external forces.
• 4. Need for support increased with size.
• 5. Need for support increased with land colonization.
• 6. Skeleton contributes to support.
• 7. Human skeleton consists of bones and cartilage.
• 8. Skeleton acts as a framework.
• 9. Skeleton supports soft tissues.
• 10. Skeleton allows free movement.
• 11. Muscles act across joints.
• 12. Study of bones and cartilage is osteology.
• 13. Bones provide rigid framework.
• 14. Cartilage provides flexible support.
• 15. Skeleton protects organs.

Remember

• - Skeleton = bones and cartilage
• - Framework = supports soft tissues
• - Movement = muscles act across joints
• - Osteology = study of bones and cartilage
• - Support = against gravity and external forces
• - Evolution = increased need for support with size and land colonization

Common Mistakes

• 1. Thinking the skeleton is only bones — It also includes cartilage.
• 2. Forgetting the role of the skeleton in movement — Muscles act across joints.
• 3. Mixing up osteology and orthopedics — Osteology = study of bones; orthopedics = treatment of bone disorders.
• 4. Thinking support is only needed on land — Support is needed in water too.
• 5. Forgetting the role of cartilage — Cartilage provides flexible support.
• 6. Believing the skeleton is not important — It is essential for support, movement, and protection.
• 7. Mixing up the functions — Support, movement, protection.
• 8. Thinking bones are dead — Bones are living tissue.
• 9. Forgetting the role of joints — Joints allow movement.
• 10. Mixing up the types of bones — Long, short, flat, irregular.

Quick Revision

Support in living organisms is necessary to uphold and sustain the body against gravity and other external forces. As the living organisms have been increased in size through the process of evolution, the need for support became greater. This was particularly true once living organisms left water and colonized land. The skeleton in animals contributes to this support. Human skeletal system consists of bones and cartilage. The skeleton acts as a framework that supports soft tissues. It allows free movement through the action of muscles across joints. The study of bones and cartilage is called osteology.

60-Second Revision

• Skeleton = bones and cartilage
• Framework = supports soft tissues
• Movement = muscles act across joints
• Osteology = study of bones and cartilage
• Support = against gravity and external forces
• Evolution = increased need for support with size and land colonization
• Warning: Skeleton includes both bones and cartilage

NEXT TOPIC

• Chapter:
• 7. Support and Movement

• Topic:
• 7.1.1 STRUCTURE OF BONE

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