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TLS Online TPP Program

#Question id: 23849

Which pathway regulates the contraction of vertebrate smooth muscle? 

#Unit 2. Cellular Organization
  1. When the Ca2+ level rises → Ca2+ binds CaM→ MLC kinase becomes inactive → dephosphorylates the myosin LC → unfolds the myosin II→ assemble into bipolar filaments for contraction. 
  2. When the Ca2+ level rises→Ca2+ binds CaM→activates MLC kinase→ phosphorylates the myosin LC→unfolds the myosin II → assemble into bipolar filaments for contraction. 
  3. When the Ca2+  returns to its resting level → Ca2+ binds CaM → activates MLC kinase→ phosphorylates the myosin LC → unfolds the myosin II→ causing muscle contraction.
  4. When the Ca2+ level rises→ Ca2+ binds CaM→ activates MLC kinase → phosphorylates the myosin LC → myosin adopts a folded conformation→ assemble into bipolar filaments for contraction. 
More Questions
TLS Online TPP Program

#Question id: 11481

#Unit 7. System Physiology – Animal

Which of the following sensory receptors is correctly paired with its category?
TLS Online TPP Program

#Question id: 12955

#Unit 7. System Physiology – Animal

Which of the following would tend to decrease GFR by more than 10% in a normal kidney?
TLS Online TPP Program

#Question id: 12954

#Unit 7. System Physiology – Animal

A 55-year-old male patient with hypertension has had his blood pressure reasonably well controlled by administration of a thiazide diuretic. During his last visit (6 months ago) his blood pressure was 130/75 mm Hg and his serum creatinine was 1 mg/100 ml. He has been exercising regularly for the past 2 years, but recently has complained of knee pain and began taking large amounts of a nonsteroidal anti-inflammatory drug. When he arrives at your office, his blood pressure is 155/85 and his serum creatinine is now 2.5 mg/100 ml. Which of the following best explains his increased serum creatinine?
TLS Online TPP Program

#Question id: 12953

#Unit 7. System Physiology – Animal

 Which of the following diuretics inhibits Na+-2Cl−-K+ co-transport in the loop of Henle as its primary action?
TLS Online TPP Program

#Question id: 12952

#Unit 7. System Physiology – Animal

Which of the following changes would tend to increase Ca2+ reabsorption in the renal tubule?
TLS Online TPP Program

#Question id: 12951

#Unit 7. System Physiology – Animal

If the cortical collecting tubule tubular fluid inulin concentration is 40 mg/100 ml and plasma concentration of inulin is 2.0 mg/100 ml, what is the approximate percentage of the filtered water that remains in the tubule at that point?