Accounting
Anthropology
Archaeology
Art History
Banking
Biology & Life Science
Business
Business Communication
Business Development
Business Ethics
Business Law
Chemistry
Communication
Computer Science
Counseling
Criminal Law
Curriculum & Instruction
Design
Earth Science
Economic
Education
Engineering
Finance
History & Theory
Humanities
Human Resource
International Business
Investments & Securities
Journalism
Law
Management
Marketing
Medicine
Medicine & Health Science
Nursing
Philosophy
Physic
Psychology
Real Estate
Science
Social Science
Sociology
Special Education
Speech
Visual Arts
Question
What is the term for the ability of cardiac muscle fibers to shorten in response to an electrical stimulus?a. contractility
b. conductivity
c. automaticity
d. excitability
Answer
This answer is hidden. It contains 389 characters.
Related questions
Q:
What effect does FIO2 1.0 at 1 atm have on the half-life of COHb?a. reduces half-life to less than 1 hour b. reduces half -life to 2.5 hours c. reduces half-life to 7.5 hoursd. reduces hal-life to 10 hours
Q:
What was the world record time established in 2008 for the longest breath hold?a. 17 minutes + b. 14 minutes + c. 10 minutes+d. 8 minutes+
Q:
Which of the following influence the volume of dissolved gas that moves into a diver's tissues during a deep dive?I. Solubility of the gas in the tissuesII. The partial pressure of the gasIII. The hydrostatic pressure in the tissuea. I, II, and III b. I and II only c. II onlyd. III only
Q:
Which of the following occur during the mammalian diving reflex during a breath hold deep dive?I. TachycardiaII. Decreased cardiac outputIII. Lactic acid acuumulationIV. Peripheral vasoconstrictiona. II, II, and IV only b. I, II, III, and IV c. I, II and III onlyd. II and IV only
Q:
If the TLC is 6.6 L at sea level, what would it equal at a depth of 33 feet under water?a. 3.3 L b. 2.2 L c. 1.1 Ld. 4.4 L
Q:
If the TLC equals 4.8 L at sea level, what would it equal at a depth of 66 feet?a. 1.8 L b. 2 L c. 3 Ld. 4.8 L
Q:
Following ascent by lowlanders to high altitudes, when do symptons of acute mountain sickness normally appear?a. 6-12 hours b. 12-24 hours c. 1-6 hoursd. 24-36 hours
Q:
In a healthy individual, how is ventilation and perfusion affected by high altitude exposure?a. Both ventilation and pulmonary perfusion are increasedb. Only perfusion is increasedc. Only ventilation is increasedd. Ventilation is increased and pulmonary perfusion decreases slightly
Q:
What changes will occur in the VC and PEFR within 24 hours of ascent to a high altitude?a. VC will decrease and PEFR will increaseb. PEFR will decrease and VC will increasec. both will decreased. both will increase
Q:
What is the primary treatment for heat stroke?a. Rapid reduction of body temperatureb. Rehydrate as rapidly as possiblec. Restore electrolytes as rapidly as possibled. Reduce PaCO2 as rapidly as possible
Q:
What increase in body heat production can occur during exercise?a. 20-fold b. 30-fold c. 10-foldd. 5-fold
Q:
What changes would be expected in the size of the heart chambers and heart mass of a marathon runner?a. Both would increaseb. Both would decreasec. No change would occurd. The size of the heart chambers would remain normal but the heart mass would increase
Q:
Which of the following physiologic changes occur during sleep?I. Colonic motility is decreasedII. Penile tumescence occurs during REMIII. Plasma growth hormones peak during Stage N3IV. The heart rate can increase by up to 35% during REMV. Cerebral blood flow decreases during non-REM sleepa. I, II, III, IV, and V b. I, II, III only c. I, III, V onlyd. II, III, and V only
Q:
Which of the following statements are true?I. Parasympathetic activity begins at sleep onset and continues throughout nonREM sleepII. Somatic skeletal muscle tone is lowest during REMIII. Body temperature falls during REM sleep and increases during non REM sleepIV. Urine production decreases during REM and non-REM sleepa. I, II, and IV only b. I, II, III, and IV c. I, III, and IV onlyd. I, II, and III only
Q:
Which sleep disorder can be treated with tracheostomy?a. OSA b. CSA c. RLSd. PLMD
Q:
Which of the following factors enhance sleep?I. Elevated body temperatureII. Frequent work shift changesIII. Caffeine ingestionIV. Moderate exercisea. IV only b. I, II, III, and IV c. II and IVd. III and IV
Q:
What portion of an adolecent's sleep time is spent in REM?a. 20% b. 30% c. 40%d. 50%
Q:
What percent of a newborn's total sleep time is spent in REM?a. 50% b. 40% c. 30%d. 20%
Q:
Which daytime diagnostic test objectively tests sleepiness by monitoring sleep latency?a. MSLT b. MWT c. PSGd. MSG
Q:
In which sleep stage(s) would K complexes commonly appear?a. N2 and N3 b. N1 c. Stage Wd. REM
Q:
Which EEG waveform is called the "relaxed wave", have a high voltage, and are often seen in the drowsy patient?a. alpha b. beta c. thetad. delta
Q:
Which agency offers a credentialing exam for the Sleep Disorder Specialist?a. NBRC b. AARC c. CoARCd. CAAHEP
Q:
Where do the ureters exit from the kidneys?a. from the hilumb. from the superior portion of the kidneysc. from the inferior portion of the kidneysd. from the posterior portion of the kidneys
Q:
How does positive pressure ventilation affect urinary output?a. It impedes venous return which stimulates ADH release and decreases urinary outputb. It enhances venous return which stimulates ADH release and increases urinary outputc. It impedes venous return which stimulates aldosterone release and decreases urinary outputd. It enhances venous return which stimulates alsosterone release and increases urinary output
Q:
What is one of the earliest clinical manifestations of prerenal failure?a. a sharp reduction in urine output b. a rapid rise in urine output c. a sudden drop in K+d. a sudden retention of HCO3-
Q:
What is the approximate osmolality of the juxtamedullary nephrons?a. 1200 mOsm/L b. 300 mOsm/L c. 150 mOsm/Ld. 600 mOsm/L
Q:
What is the net filtration pressure in the glomeruli?a. 10 mm Hg b. 30 mm Hg c. 55 mm Hgd. 75 mm Hg
Q:
What volume of fluid is filtered per minute by the glomeruli?a. 125 mL/min b. 60 mL/min c. 30 mL/mind. 15 mL/min
Q:
Which would the SVR equal (dynes x sec x cm-5) if MAP equals 90 mm Hg, CVP is 8 mmHg, and CO is 4.5 L/min?a. 1457 b. 1227 c. 1640d. 1170
Q:
Which hemodynamic meausrement would be most increased when a pulmonary embolism is present?a. mean pulmonary pressure b. SVR c. PCWPd. LVSWI