IB Biology Topic B3.3.6 Movement at a Synovial Joint Revision Notes (HL)

IB Biology Topic B3.3.6 Movement at a Synovial Joint Revision Notes (HL) | RevisionDojo

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The Hip Joint Shows How a Synovial Joint Enables Movement

Definition

Synovial joint

Highly mobile joints that allow a wide range of movements.

The hip is a ball-and-socket synovial joint linking the femur and the pelvis.
Its structure allows flexion, extension, abduction, adduction, and rotation.

Bones Form the Framework for Movement

Femur: has a rounded head, the "ball", that fits into the socket of the pelvis.
Pelvis: forms a deep socket, the acetabulum, that holds the femoral head.
Shape and fit: together these set the joint's range of motion and stability.

Tip

The deep socket of the hip trades some mobility for extra stability, which is why the hip dislocates far less easily than the shallower shoulder joint.

Cartilage Reduces Friction and Absorbs Shock

Articular cartilage is smooth, tough tissue covering the bone ends.
It reduces friction between the moving bones.
It absorbs impact, protecting the joint during high-impact activity.

Common Mistake

Students often confuse cartilage with bone.
Cartilage is softer, lacks calcium deposits, and is built for flexibility and shock absorption.

Synovial Fluid Lubricates the Joint

Location: it fills the joint cavity between the bones.

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Tip

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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The Hip Joint Shows How a Synovial Joint Enables Movement

Definition

Synovial joint

Highly mobile joints that allow a wide range of movements.

The hip is a ball-and-socket synovial joint linking the femur and the pelvis.
Its structure allows flexion, extension, abduction, adduction, and rotation.

Bones Form the Framework for Movement

Femur: has a rounded head, the "ball", that fits into the socket of the pelvis.
Pelvis: forms a deep socket, the acetabulum, that holds the femoral head.
Shape and fit: together these set the joint's range of motion and stability.

Tip

The deep socket of the hip trades some mobility for extra stability, which is why the hip dislocates far less easily than the shallower shoulder joint.

Cartilage Reduces Friction and Absorbs Shock

Articular cartilage is smooth, tough tissue covering the bone ends.
It reduces friction between the moving bones.
It absorbs impact, protecting the joint during high-impact activity.

Common Mistake

Students often confuse cartilage with bone.
Cartilage is softer, lacks calcium deposits, and is built for flexibility and shock absorption.

Synovial Fluid Lubricates the Joint

Location: it fills the joint cavity between the bones.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B3.3.6: Movement at a Synovial Joint Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

The Hip Joint Shows How a Synovial Joint Enables Movement

Bones Form the Framework for Movement

Cartilage Reduces Friction and Absorbs Shock

Synovial Fluid Lubricates the Joint

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

The Hip Joint Shows How a Synovial Joint Enables Movement

Bones Form the Framework for Movement

Cartilage Reduces Friction and Absorbs Shock

Synovial Fluid Lubricates the Joint

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account