JOINTS AND JOINT MOVEMENTS WORKSHEET Complete the | Chegg.com - Free Printable

Let's go through each question and provide detailed answers based on the content of the image.

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3. What characteristics do all joints have in common?

Answer:
All joints have the following characteristics in common:

- They connect two or more bones.
- They allow for movement between the bones (though the degree of movement varies).
- They are formed by specialized tissues such as cartilage, ligaments, and joint capsules.
- They contain some form of connective tissue that provides structural support and stability.
- They are involved in facilitating motion, providing support, and protecting the body’s structure.

> *Note:* While there are different types of joints (fibrous, cartilaginous, synovial), these shared features apply to all.

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4. Describe the structure and function of the following structures or tissues in relation to a synovial joint.

#### Ligament
- Structure: Dense regular connective tissue composed mainly of collagen fibers; connects bone to bone.
- Function: Stabilizes the joint by preventing excessive movement and maintaining alignment between bones.

#### Articular Cartilage
- Structure: Smooth, white, hyaline cartilage covering the ends of articulating bones.
- Function: Reduces friction between bones during movement and absorbs shock during weight-bearing activities.

#### Synovial Membrane
- Structure: Thin layer of connective tissue lining the inner surface of the articular capsule (except where it covers articular cartilage).
- Function: Produces synovial fluid, which lubricates the joint and nourishes the articular cartilage.

#### Bursa
- Structure: Fluid-filled sac made of synovial membrane, located between tendons, muscles, and bones.
- Function: Reduces friction between moving parts (e.g., tendon and bone) during joint movement.

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5. Which joint, the hip or the knee, is more stable?

Answer:
The hip joint is more stable than the knee joint.

Two important factors contributing to the stability of the hip joint:

1. Deep socket (acetabulum) – The hip joint is a ball-and-socket joint where the head of the femur fits deeply into the acetabulum of the pelvis, providing strong mechanical stability.
2. Strong ligaments – The hip joint has thick, strong ligaments (such as the iliofemoral, pubofemoral, and ischiofemoral ligaments) that reinforce the joint capsule and limit excessive movement.

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6. Complete the following statement:

> During muscle contraction, the origin moves toward the insertion.

Explanation:
- In skeletal muscles, the origin is the attachment point that remains relatively fixed during contraction.
- The insertion is the attachment point that moves toward the origin when the muscle contracts.
- This principle applies to the biceps brachii shown in the diagram: when it contracts, the forearm (insertion) moves upward toward the shoulder (origin).

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✔ Summary of Answers:

| Question | Answer |
|--------|--------|
| 3 | All joints connect bones, allow movement, involve connective tissues, and contribute to body support and motion. |
| 4 | - Ligament: Connects bone to bone; stabilizes joint.<br>- Articular cartilage: Covers bone ends; reduces friction and absorbs shock.<br>- Synovial membrane: Lines joint capsule; produces synovial fluid.<br>- Bursa: Fluid-filled sac; reduces friction between tissues. |
| 5 | Hip joint is more stable.<br>Factors: Deep socket (acetabulum), strong ligaments. |
| 6 | During muscle contraction, the origin moves toward the insertion. |

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