PSIO practice exam 3

skeletal muscle contraction is considered voluntary which means ALL of the following are true except

• Nervous system input is required

• All skeletal muscles are autonomic

• Some skeletal muscles can be autonomic

• A&C are correct

• A&B are correct

Which of the following matches insertion and origin to their correct characteristics during muscle action

• Insertion: Place where muscle starts on bone

  Origin: Place where muscle ends on bone

  Origin moves towards the insertion

• Insertion: Place where muscle starts on bone

  Origin: Place where muscle ends on a bone

  Insertion moves towards the origin

• Insertion: Place where muscle ends on bone

  Origin: Place where muscle starts on bone

  Insertion moves towards to origin

• Insertion: place where muscle ends on bone

  Origin: Place where muscle starts on bone

  Origin moves towards the insertion

The purpose of flexion and extension is...

• Movement away or towards the midline

• Movement to reduce or increase the angle at a joint

• Reverse a muscle action

• None of the above

When abducting the arm, which option places the correct muscle to its action

• Agonist: Latissimus dorsi

  Antagonist: Deltoid

  Synergist: trapezius

  fixator : supraspinatus

• Agonist: deltoid

  Antagonist: latissimus dorsi

  Synergist: trapezius

  Fixator: supraspinatus

• Agonist: Latissimus dorsi

  Antagonist: deltoid

  Synergist: supraspinatus

  Fixator: trapezius

• Agonist: Deltoid

  Antagonist: Latissimus Dorsi

  Synergist: supraspinatus

  Fixator: Trapezius

Which types of joints tend to classify as third class levers?

• Fibrous joints

• Hinge type joints

• ball and socket joints

• synovial joints

Which of the following best explains the difference between a muscle action and reverse muscle action?

• During muscle actions the insertion moves towards the origin

  During reverse muscle action the insertion is anchored forcing the origin to move towards the insertion

• During muscle actions the origin moves towards the insertion

  During reverse muscle action the origin is anchored forcing the origin to move towards the insertion

• During muscle action the muscle has to generate more ATP to be able to perform an action while Reverse muscle action requires less ATP

• A& C are correct

The smallest component of structural organization in muscle is _____ and this is typically covered by the ____ when bundled together.

• Fascicle; sarcolemma

• Fascicle; epimysium

• Myofibril; Perimysium

• Myofibril: sarcolemma

Which of the following correctly describes what happens to bands during muscle contraction?

• H zone nearly disappears

  A band shortens

  I band remains constant

• H zone nearly disappears

  A band increases

  I band increases

• H zone nearly disappears

  A band remains constant

  I band

  shortens

• H zone grows

  A band shrinks

  I band shortens; nearly disappears

Which of the correctly classifies the proteins of a sarcomere

• Actin and Myosin- structural

  Troponin and Tropomyosin- contractile

  Nebulin, a-actinin, dystrophin, titin Myomesin

  - regulatory

• Actin and Myosin- Contractile

  Troponin and tropomyosin- regulatory

  Nebulin, dystrophin, a-actinin, titin, myomesin -structural

• Actin and Myosin- Regulatory

  Troponin and tropomyosin- Contractile

  Nebulin, dystrophin, a-actinin, titin, myomesin - Structural

• Actin and Myosin- contractile

  Troponin and tropomyosin - structural

  Nebulin, dystrophin, a-actinin, titin, myomesin- regulatory

Which of the following is considered the functional unit of contraction?

• myosin

• dystrophin

• sarcomere

• sarcolemma