Understanding Muscular Origins and Insertions

What happens to a muscle when it contracts?

• It remains the same length

• It lengthens

• It shortens

• It detaches from the bone

Tags

NGSS.MS-LS1-3

What is the term for the bone that does not move during muscle contraction?

• Insertion

• Joint

• Ligament

• Origin

What is the primary function of tendons?

• To connect muscle to bone

• To provide nutrients to muscles

• To facilitate bone movement

• To connect bone to bone

What typically moves towards the origin during muscle contraction?

• The origin

• The insertion

• The tendon

• The ligament

Can the designation of a muscle's origin and insertion change?

• Yes, depending on the movement

• Only in non-human animals

• No, they are fixed points

• Only during surgical procedures

What demonstrates the variability of muscle attachment points?

• Muscle elasticity

• Bone density

• Stabilization of different bones

• Muscle color

What is the effect of changing the stabilization point on muscle origin and insertion?

• It weakens the muscle

• It can reverse the roles of origin and insertion

• It changes the muscle's function

• It has no effect

In the example of the gluteus medius, what happens when the femur is stabilized?

• The femur detaches

• The muscle contracts without movement

• The ilium moves towards the femur

• The ilium becomes the insertion

What role does the gluteus medius play when lifting the opposite leg off the ground?

• It relaxes completely

• It moves the femur towards the ilium

• It contracts without effect

• It stabilizes the pelvis

Why does the instructor prefer the terms 'proximal attachment' and 'distal attachment'?

• They are required by medical terminology

• They are more scientifically accurate

• They reflect the dynamic nature of muscle attachments

• They are easier to remember