Function of calcium ions in skeletal muscle contractions

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Reference no: EM133930458

Question

Part l: Choose the best answer for the following multiple-choice questions.

1. The two filaments that for cross-bridges are:

a. Actin and troponin

b. Actin and tropomyosin

c. Tropomyosin and myosin

d. Actin and myosin

e. Troponin and tropomyosin

2. What is the function of calcium ions in skeletal muscle contractions?

a. Bind to regulatory proteins so that the myosin binding sites on the actin can be exposed

b. To stimulate the release of potassium ions and stop the contraction from happening

c. To bind with tropomyosinase to allow to release tactic acid

d. Bind to the myosin binding sites on actin so -that myosin will have something to attach to initiating active transport of calcium carbonate

3. From superficial to deep, the correct order of muscle structure is:

a. Epimysium, perimysium, endomysium, deep fascia

b. Deep fascia, epimysium, perimysium, and endomysium

c. Perimysium, endomysium, deep fascia, epimysium

d. Epimysium, ectomysium, deep fascia, endomysium

4. Blood vessels and nerve endings are found in the:

a. Dermis.

b. Epidermis

c. Subcutaneous layer

d. All of the above are correct

5. An immediate need of a muscle in addition to ATP for the muscle to contract would be:

a. Calcium

b. Phosphorus

c. Oxygen

d. Carbon dioxide

6. In the sliding filament theory of muscle contraction, which of the following occurs:

a. Actin filaments stretch

b. Actin filaments slide past myosin filaments pulled by the ratcheting action of the myosin heads

c. Myosin filaments slide past actin filaments pulled by the ratcheting action of the Actin heads

d. Both actin and myosin pull on the edges of the muscle unit

7. Which is true regarding muscle fibers?

a. Thick filaments are lipids called actin

b. Thin filaments are proteins called myosin

c. Thin filaments are proteins called actin

d. None of the above are true

Part 2: True or False

8. Muscle fibers are made up of alternating light and dark striations.

9. Muscle cells have many mitochondria which mean more ATP molecules.

10. Cardiac muscle is involuntary.

11. Skeletal muscle is voluntary because you can control this type of muscle.

12. Smooth muscles attach to bone directly.

13. Smooth muscles fine internal organs.

14. Tendons attach directly to bone.

15. Muscle fibers are composed of tubular myofibrils.

16. Myofibrils are composed of repeating sections of sarcomere, which appear under the microscope as many repeating light bands only

17. The sarcomere includes both Z discs and the A band.

18. The sarcoplasmic reticulum is a real organelle of a muscle cell.

19. Skeletal muscles consist of numerous bundles or subunits called fascicles.

20. This type of muscle shape is circular and can be found around the orbital of the eye.

21. This type of muscle shape is fusiform, like the biceps brace, and looks like multiple feathers.

22. This type of muscle shape has a belly, like the pectorals major, and looks like a parallel solid cylinder.

23. This type of muscle shape, like the rectus femoris, is bipennate, like a complete feather.

Reference no: EM133930458

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