15. Athletes who train at high altitudes increase their red blood cell count and
ID: 3481838 • Letter: 1
Question
15. Athletes who train at high altitudes increase their red blood cell count and thus increase their oxygen supply during exercise. Increased oxygen supply results in
A. increased glycolysis. B. increased use of myokinase. C. longer aerobic respiration.
D. longer anaerobic fermentation. E. reduced ATP consumption.
16. Cardiac muscle has very little capacity for regeneration because it lacks
A. satellite cells. B. endomysium. C. sarcomeres.
D. dense bodies. E. somatic nerve fibers.
17. Which of the following would be caused by contraction of smooth muscle?
A. goose bumps B. elevating the eyebrows C. blinking the eyelids
18. Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate. These drugs
A. prevent calcium from entering the sarcoplasmic reticulum of smooth muscle.
B. stimulate the calcium pump in smooth muscle, thus removing calcium from the calmodulin.
C. prevent calcium from exiting the sarcoplasmic reticulum in skeletal muscle.
D. prevent calcium from entering cardiac muscle, thus slowing down the heart rate.
E. prevent calcium from entering smooth muscle, thus allowing the muscle to relax.
19. Loss of muscle mass from lack of activity is termed ______________
20. A reason that muscle twitches become progressively stronger in treppe is ____________
21. What does Creatine kinase do during muscle contraction? ____________
22. Which of the following has the largest number of mitochondria?
A. slow oxidative fibers B. smooth muscle C. cardiac muscle
23. The absence or inhibition of AChE at a synapse would lead to which of the following?
A. flaccid paralysis B. tetanus C. atrophy
D. numbness E. muscle wasting
24. Which statement best describes the goal of medications used to treat myasthenia gravis?
A. to increase the number of ACh receptors
B. to decrease the number of synaptic vesicles
C. to promote multiple motor unit summation
D. to inhibit Ca2+ release from the sarcoplasmic reticulum
25. Where would you expect to find numerous gap junctions in muscular tissue? ___________
26) At each end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium, come together to form a ________________
27) Nerves and blood vessels that service a muscle fiber are located in the tissues of its
A) endomysium. B) perimysium. C) sarcolemma. D) sarcomere. E) myofibrils.
28) At rest, the tropomyosin molecule is held in place by
A) actin molecules. B) myosin molecules. C) troponin molecules. D) ATP molecules. E) calcium ions.
29) The region of the sarcomere that always contains thin filaments is the
A) Z line. B) M line. C) H band. D) A band. E) I band.
30) In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases _____________
31) The narrow space between the synaptic terminal and the muscle fiber is the ___________
32) Active sites on the actin become available for binding after
A) actin binds to troponin. B) troponin binds to tropomyosin.
C) calcium binds to troponin. D) calcium binds to tropomyosin.
33) The action potential is conducted into a skeletal muscle fiber by
A) motor end plates. B) neuromuscular junctions. C) transverse tubules.
D) triads. E) sarcoplasmic reticulum.
34) The muscle weakness of myasthenia gravis results from
A) insufficient acetylcholine release from presynaptic vesicles.
B) loss of acetylcholine receptors in the end-plate membrane.
C) the motor neuron action potential being too small to shock the muscle fibers.
35) The type of contraction in which the muscle fibers do not shorten is called
A) tetany. B) treppe. C) concentric. D) isotonic. E) isometric.
36) Creatine phosphate
A) is produced by the process of anaerobic respiration.
B) can replace ATP in binding to myosin molecules during contraction.
C) acts as an energy reserve in muscle tissue.
37) Muscles that guard entrances and exits of internal passageways are ________ muscles.
A) parallel B) convergent C) pennate D) bipennate E) circular
38) The period during which an excitable membrane cannot respond to further stimulation is the ________.
39) An ________ can be described as a broad tendinous sheet.
40) Thick filaments are made of the protein ________.
Explanation / Answer
15.ATP- Adenosine triphosphate is very important energy molecules which gives energy to cell while doing exercise. This is produced by 2 ways one is aerobic respiration and other is anaerobic respiration.
Aerobic respiration involves the requirement of oxygen by which ATP is produced. It gives more energy and less fatigue compared to anaerobic respiration in cells because there is no lactic acid production in cells.
So increased oxygen supply results in more oxygen supply to the cells and increased duration of aerobic respiration in cells, which is required in long term activities like marathon, swimming etc.
So the answer is C. Longer aerobic respiration.
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