Spot the false claim about muscles

Exercise and reference answers

Questions

1. False statement

   A muscle anchored far from its joint has a small mechanical advantage.

   Statements

   1. Muscles can only contract, so they work in pairs.
   2. A muscle anchored far from its joint has a small mechanical advantage.
   3. The triceps is an extensor that opens the limb.

2. False statement

   Skeletal muscles usually exert smaller forces than the limbs apply outside.

   Statements

   1. The jaw masseter beats a mechanical advantage of one at the back teeth.
   2. Back muscles work with mechanical advantages well below one.
   3. Skeletal muscles usually exert smaller forces than the limbs apply outside.

3. False statement

   The biceps force holding a forearm and book is less than the weight held.

   Statements

   1. The biceps force holding a forearm and book is less than the weight held.
   2. Good posture puts the upper body centre of gravity over the hip pivot.
   3. Bad posture makes the lower back muscles exert large forces.

4. False statement

   The pivot of a joint stays in one fixed spot as the joint bends.

   Statements

   1. Muscles anchored close to joints buy limbs speed and agility.
   2. The pivot of a joint stays in one fixed spot as the joint bends.
   3. Forces inside joints can run several times the weight supported.

Instructions

Tap the one statement in each set that is not true.

Explanation