Agenda12/2/13

• White board review• EVERY student needs a white board

6. muscles use stored ____ for energy

A. ADPB. Ca⁺⁺C. ATPD. All of the above

9. The contraction of all skeletal muscle cells is due to the movement of?

A. Thick filamentsB. EndomysiumC. MitochondriaD. Thin filaments

10. This letter represents?Be able to label this diagram, not on answer key

11. The letters point to?Be able to label this diagram, not on answer key

12. The plasma membrane of skeletal muscle cells is called ________

A. SarcomereB. SarcolemmaC. T-tubuleD. Neuromuscular junction

13. Muscle tissue has the ability to shorten when adequately stimulated, a characteristic known as

__________.

A. ContractilityB. excitabilityC. ElasticityD. Extensibility

14. The heads of the myosin Myofilaments are called __________ when they link the thick and thin

filaments together during skeletal muscle contraction.

A. Cross bridgesB. Creatine phosphateC. A bandD. I band

15. gap between the motor neuron and the muscle fiber it supplies at the neuromuscular

junction is called the __________.

A. Neuromuscular junctionB. Motor end plateC. Axon terminalD. Synaptic cleft

18. Voluntary muscle tissue is;

A) smooth muscleB) skeletal muscleC) dense regularD) cardiac muscleE) dense irregular

19. Endomysium covers:

A) fascicles of muscle cellsB) an entire muscleC) an individual muscle cellD) myofibrilsE) smooth muscle only

21. Which of the following is NOT a function of the muscular system:

A) production of movementB) maintenance of postureC) stabilization of jointsD) generation of heatE) Hematopoiesis

22. A Sarcomere is:

A) the nonfunctional unit of skeletal muscleB) the contractile unit between two Z discsC) the area between two intercalated discsD) the wavy lines on the cell, as seen in a

microscopeE) a compartment in a Myofilaments

23. Which one of the following is composed of myosin protein:

A) thick filamentsB) thin filamentsC) all MyofilamentsD) Z discsE) light bands

24. An elaborate and specialized network of membranes in skeletal muscle cells that function in

calcium storage is the:

A) sarcolemmaB) mitochondriaC) intermediate filament networkD) myofibrillar networkE) Sarcoplasmic reticulum

25. During skeletal muscle contraction, myosin heads attach to active sites of:

A) myosin filamentsB) actin filamentsC) Z discsD) thick filamentsE) the H zone

26. Neurotransmitters are released upon stimulation from a nerve impulse

by the:

A) myofibrilsB) motor unitC) thick filamentsD) axon terminals of the motor neuronE) sarcolemma of the muscle cell

28. Which of the following can actually shorten during a muscle contraction:

A) myosin filamentsB) A bandsC) actin filamentsD) Sarcomere

29. Place these structures of the skeletal muscle in order from largest to smallest:

1. fascicle2. Myofilaments3. muscle fiber (cell)4. myofibril5. Sarcomere

1, 3, 4, 5, 2

32. Why are calcium ions necessary for skeletal muscle contraction:

A) calcium increases the action potential transmitted along the sarcolemma

B) calcium releases the inhibition on Z discsC) calcium triggers the binding of myosin to actinD) calcium causes ATP binding to actinE) calcium binds to regulatory proteins on the

myosin filaments, changing both their shape and their position on the thick filaments

33. Acetylcholine is

A) an ion pump on the postsynaptic membraneB) a source of energy for muscle contractionC) a component of thick MyofilamentsD) an oxygen-binding proteinE) a neurotransmitter that stimulates skeletal

muscle

34. Which of these events must occur first to trigger the skeletal muscle to generate an

action potential and contract:

A) sodium ions rush into the cellB) acetylcholine (ACh) causes temporary permeability

to sodiumC) diffusion of potassium ions out of the cellD) operation of the sodium-potassium pumpE) acetylcholinesterase (AchE) breaks down

acetylcholine (ACh)

Answers• C• D• B• A• A• D• B• C• E• B• A

• E• B• D• D• 1,3,4,5,2• C• E• B