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Support and movement in animals — KCSE Biology

KCSE Biology · 83 practice questions · 3 syllabus objectives · 3 revision lessons

29 easy32 medium22 hard

Last updated · Aligned to the KNEC KCSE syllabus

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe the structure and functions of the human skeleton

Describe how antagonistic muscles produce movement

Support and movement in animals

Revision Notes

Concise lesson notes for Support and movement in animals, written to the KCSE Biology marking standard. Read the first lesson free below.

Structure and Functions of the Human Skeleton

The human skeleton consists of 206 bones and is divided into two main parts: the axial skeleton and the appendicular skeleton. The axial skeleton includes the skull, vertebral column, and rib cage, while the appendicular skeleton comprises the limbs and pelvic girdle.

Functions of the skeleton:

  • Support: Provides a framework that supports the body and cradles soft organs.
  • Movement: Serves as levers for muscles to act upon, facilitating movement.
  • Protection: Shields vital organs, such as the brain (skull) and heart/lungs (rib cage).
  • Mineral storage: Stores minerals like calcium and phosphorus, releasing them into the bloodstream as needed.
  • Blood cell production: Houses bone marrow, which produces red and white blood cells.

Structure of bones: Bones are composed of compact bone (dense outer layer) and spongy bone (inner layer with a porous structure). The outer surface is covered by periosteum, a tough membrane that aids in repair and growth.

In summary, the human skeleton is essential for support, movement, protection, mineral storage, and blood cell production.

Key points to remember

  • The skeleton has 206 bones in total.
  • It is divided into axial and appendicular skeleton.
  • Functions include support, movement, and protection.
  • Bones store minerals and produce blood cells.
  • Compact and spongy bone comprise the structure.

Worked example

Describe the main functions of the human skeleton.

  • The human skeleton provides support, allowing the body to maintain its shape.
  • It enables movement by acting as levers for muscles.
  • It protects vital organs such as the brain and heart.
  • The skeleton stores minerals like calcium and produces blood cells.

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Lesson 2: Antagonistic Muscles and Movement

Objective: Describe how antagonistic muscles produce movement

Antagonistic muscles work in pairs to produce movement in animals. When one muscle contracts, the other relaxes, allowing for coordinated motion. This mechanism is crucial for various movements, including walking, running, and grasping.

Key Features of Antagonistic Muscles:

  • Muscle Pairs: Each pair consists of an agonist (the contracting muscle) and an antagonist (the relaxing muscle).
  • Opposite Actions: For example, when the biceps contract to bend the elbow, the triceps relax.
  • Joint Movement: This process allows joints to flex and extend smoothly.

Example of Movement:

  • Flexing the Arm:
    • The biceps brachii contracts (agonist).
    • The triceps brachii relaxes (antagonist).
    • The forearm moves towards the shoulder, bending at the elbow.

Understanding this interaction is essential for comprehending how animals achieve complex movements and maintain balance.

  • Antagonistic muscles work in pairs for coordinated movement.
  • One muscle contracts while the other relaxes.
  • This mechanism is vital for joint movement and flexibility.

Describe how antagonistic muscles produce movement in the human arm.

  • The biceps brachii contracts to flex the arm.
  • The triceps brachii relaxes to allow this movement.
Lesson 3: Support and Movement in Animals

Objective: Support and movement in animals

In animals, support and movement are crucial for survival and functioning. Animals possess various structures that provide support and facilitate movement. Key components include:

  • Skeleton: The internal or external framework that supports the body. Invertebrates have exoskeletons, while vertebrates have endoskeletons.
  • Muscles: Tissues that contract and relax to produce movement. They work in pairs (antagonistic muscles) to move bones.
  • Joints: Connections between bones that allow for flexibility and movement in various directions.

Types of skeletons:

  • Hydrostatic skeleton: Found in soft-bodied animals like earthworms, using fluid pressure for support.
  • Exoskeleton: A hard outer structure, as seen in insects and crustaceans, providing protection and support.
  • Endoskeleton: Internal skeleton found in vertebrates, made of bone or cartilage, allowing for greater size and complexity.

Understanding these structures helps explain how animals adapt to their environments and perform essential functions like locomotion and feeding.

  • Animals have skeletons for structural support and protection.
  • Muscles enable movement through contraction and relaxation.
  • Joints allow flexibility and a range of motion.
  • Hydrostatic, exoskeleton, and endoskeleton are types of skeletons.
  • Support structures help animals adapt to their environments.

Describe the role of muscles in animal movement.

  • Muscles contract to pull on bones, causing movement.
  • Antagonistic pairs work together to allow smooth motion.

Sample Questions

Read 3 questions and answers free. Sign up to access all 83 questions with full KNEC-style marking schemes and a personalised study plan.

1
easySHORT ANSWER2 marks

In the study of animal physiology, understanding the structures that facilitate movement and provide support is essential. This includes exploring the roles of various connective tissues that contribute to the functionality of the musculoskeletal system. (a) Distinguish between a tendon and a ligament. (2 marks) (b) State two functional difference(s) between a tendon and a ligament. (two marks)

Answer & marking scheme

Part (a) — 2 marks
Tendons transmit the force of muscle contraction to the bone to bring about movement; ligaments hold bones together at joints / prevent dislocation (1 mk)
Tendons are inelastic to efficiently transmit force; ligaments are slightly elastic to allow some flexibility at joints while maintaining stability (1 mk)
2
easySHORT ANSWER2 marks

Name the type of joint found at the articulation of: (a) pelvic girdle and femur (1 mark) (b) humerus and ulna (1 mark) (c) State two characteristic(s) of a ball-and-socket joint. (two marks)

Answer & marking scheme

Part (a) — 2 marks
Allows movement in all directions / planes (360°) / allows rotation, flexion, extension, abduction, and adduction (1 mk)
Has a rounded head of one bone fitting into a cup-shaped socket / cavity of another bone (1 mk)
3
easySHORT ANSWER2 marks

The remarkable adaptations of various animal groups enable them to thrive in diverse environments. This includes specialized structures that provide support and facilitate movement, particularly in those with external protective coverings. (a) Name the phylum whose members possess an exoskeleton and a segmented body. (1 mark) (b) Name the substance that the arthropod exoskeleton is made of. (1 mark) (c) State two functions of the exoskeleton in arthropods. (two marks)

Answer & marking scheme

Part (a) — 2 marks
Provides support / maintains body shape (1 mk)
Protects internal organs from physical damage and predators / prevents water loss (waterproof) / provides surface for muscle attachment (1 mk)
4

The human skeletal system plays a crucial role in providing support and facilitating movement. In this context, focus on the specific components of the pelvic bone and their functions. (a) State the function of the acetabulum on the pelvic bone. (1 mark) (b) State the function of the obturator foramen on the pelvic bone. (1 mark) (c) Name three bones that make up the pelvic girdle. (three marks)

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Frequently asked questions

What does the KCSE Biology topic "Support and movement in animals" cover?

Support and movement in animals covers Describe the structure and functions of the human skeleton; Describe how antagonistic muscles produce movement; Support and movement in animals, all aligned to the official KNEC KCSE Biology syllabus.

How many practice questions are available for Support and movement in animals?

HighMarks has 83 Support and movement in animals practice questions for KCSE Biology, each with a full marking scheme. The first 3 are free; sign up to access the rest, plus all KCSE mock exams and past papers.

Are these aligned with the KNEC KCSE syllabus?

Yes. Every objective on this page is taken directly from the official KNEC KCSE Biology syllabus. Practice questions match the KCSE exam format and are graded against the standard KNEC marking scheme.

How should I revise Support and movement in animals for the KCSE exam?

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