Kingsborough Community College of The City University of New York
Biology 11 - Quiz 3a - Muscular Tissue
1. Skeletal muscles are bound to surrounding tissues and other muscles with a type of connective tissues called
a. tendon b. endomysium c. ligament d. perimysium e. fascia
2. Muscle fibers composing a striated muscle
a. are multinucleate and very long c. are multinucleate, very long and possess few organelles
b. have only one nucleus and are very long d. are multinucleate, short cells with many organelles
3. The neurotransmitter sending chemical signals at neuromuscular junctions of skeletal muscle is
a. actin b. myosin c. troponin d. acetylcholine e. cholinesterase
4. The membrane that carries the muscle fiber's electrical signal from the surface to the fiber's interior is the
a. t-tubule (transverse tubule) b. SR (sarcoplasmic reticulum) c. CM (cell membrane) d. post-synaptic membrane
5. The mineral released from the _______into a fiber that activates _______ to cause muscle contraction is_______.
a. t-tubules, ATP, Na+ b. SR, DNA, Ca+2 c. SR, ATP, Ca+2 d. t-tubules, DNA, Ca+2 e. SR, ATP, K+
6. Two abundant organelles in skeletal muscle are
a. cilia and lysosomes b. ATP and glucose c. mitochondria and ATP d. myofibrils and mitochondria
7. Motor unit a. Variations in the degree of muscle contraction.
8. Myogram b. The graphic recording of a muscle's contraction.
9. Graded responses c. The condition where a muscle's power gradually drops and may reach zero.
10. Tetanus d. A motor neuron and all the muscle fibers it innervates (supplies).
11. Fatigue e. A smooth, sustained muscle contraction.
12. Glucose a. Can cause fatigue as it builds up in muscle under anaerobic conditions.
13. Creatine phosphate b. A muscle fiber's immediate source of energy for contraction.
14. Adenosine triphosphate c. A muscle's storage form of energy for contraction.
15. Lactic acid d. The aerobic, large energy-generating part of cellular respiration.
16. ETS (electron transport system) e. The body's energy source circulating in the blood.
17. The hypertrophy of muscles is due to
a. increased numbers of myofibrils and the increased amount of connective tissue in the muscle
b. increased numbers of fibers inside the muscle
c. increased numbers of both fibers and myofibrils inside the muscle
d. increased storage of glucose, myoglobin, ATP and creatine phosphate in the muscle
18. Muscle fascicles are surrounded by
a. epimysium b. perimysium c. endomysium d. fascia e. tendon
19. An electrical stimulus to a muscle that fails to bring about contraction is called a
a. maximal stimulus b. minimal stimulus c. tetanic stimulus d. subliminal stimulus
20. I f you are exercising and you are breathing normally (not out-of-breath), then your muscles are working
a. very rapidly b. aerobically c. anaerobically d. very slowly e. both c and d
21. Wave summation a. Increased force of contraction as more and more fibers in a muscle contract.
22. Multiple motor unit summation b. Lowest voltage that brings about muscle contraction.
23. Minimal stimulus c. Contraction without shortening.
24. Isotonic contraction d. Contraction with shortening.
25. Isometric contraction e. More rapid contractions due to more rapidly delivered stimuli.
26. Glycolysis a. The anaerobic breakdown of glucose to pyruvic acid.
27. Kreb's cycle b. An aerobic pathway that generates the greatest number of ATP molecules.
28. Electron transport chain c. A pathway that generates electrons, hydrogen ions and CO2.
29. Mitochondria d. An O2-binding molecule in some muscles.
30. Myoglobin e. An organelle where the Kreb's cycle and the electron transport chain operate.
31. Prime movers (agonists) a. Muscles that prevent a bone from moving while other muscles are working.
32. Synergists b. Muscle pairs that produce opposite movements across a given joint.
33. Antagonists c. Muscles that help prime movers do their job more powerfully and efficiently.
34. Fixators d. Muscles producing forces opposite to that of the prime movers.
35. Antagonistic muscles e. Muscles that produce most of the force in a particular joint movement.
Essays - Use the space below the questions to write your answers and draw your diagrams.
1. Explain how a whole muscle is constructed. Use diagrams to support your answer. (15)
2. Explain how actin and myosin interact to bring about muscle contraction. Use a diagram to support your answer.