MUSCULOSKELETAL SYSTEM AND LEVERS

Question 1

What kind of structure is the lever?

Answer 1

Rigid structure

Question 2

How does a lever move?

Answer 2

Moves on a fixed point known as fulcrum (Fc)

Question 3

What does the lever move?

Answer 3

A weight (W)

Question 4

What is requried to move weight generated by muscle contraction?

Answer 4

Force (F)

Question 5

What is first-class lever?

Answer 5

Fulcrum (Fc) located between muscle force (F) and weight (W)

Question 6

What happens during first-class lever?

Answer 6

Increases range and speed of movement, but requires larger force

Question 7

What is an example of first-class lever?

Answer 7

Skull; not many examples in the body

Question 8

Which way is the force being pushed in first-class lever?

Answer 8

Down

Question 9

What is second-class lever?

Answer 9

Weight (W) is located between muscle force (F) and fulcrum (Fc)

Question 10

What happens during second-class lever?

Answer 10

Increases force, but at the expense of range and speed of movement

Question 11

What is an example of second-class lever?

Answer 11

In the foot/calf; not many examples in the body

Question 12

Which way is the force being pushed in second-class lever?

Answer 12

Up

Question 13

What is third-class lever?

Answer 13

Force (F) is applied between weight (W) and fulcrum (Fc)

Question 14

What happens during third-class lever?

Answer 14

Increase range and speed of movement, but at the expense of force

Question 15

What is an example of third-class lever?

Answer 15

In the arm/forearm; most common in the body

Question 16

Which way is the force being pushed in third-class lever?

Answer 16

Up

Question 17

What is the action of lesser gluteal muscles?

Answer 17

Abduction of thigh at hip joint

Question 18

What is the function of the lesser gluteal muscles?

Answer 18

Keep the pelvis from titling down on unsupported side (side of swinging leg) during walking