Exam 2 Flashcards
What is the effect of adding a drug to a skeletal muscle that makes DHP receptor non-functional?
Muscle will not show a contraction upon stimulation
What happens during an isotonic muscle contraction?
Parallel elastic components get shorter
What is the order of events in excitation-contraction coupling?
Motor endplate depolarizes
Action potential travels over muscle cell membrane
action potential travels down t tubules
Ca2+ released through channels from SR
Myosin heads pull actin along thick filaments
What portion of a marathon would be affected from a genetic mutation that does not produce functional creatine phosphate?
Just the beginning
What causes smooth muscle to relax?
Removal of phosphate from myosin
Which motor neurons release acetylcholine to stimulate muscle contractions?
Parasympathetic neurons connected to smooth muscles
Somatic neurons connected to skeletal muscles
Which hormone controls target cells by a similar mechanism to the regulation of T3 and T4?
Cortisol
What is the action of the growth hormone on energy metabolism?
Anti-insulin affect
What hormone is NOT released by the anterior pituitary gland?
Calcitonin
How does reduced plasma proteins affect the endocrine system?
Reduced rate of delivery of hydrophobic hormones like steroids and thyroid hormones
What is the mode of action of insulin in muscle and fat cells involving?
Adding GLUT-4 transporters
What does sympathetic stimulation of the heart reult in?
Reduced repolarization of the pacemaker potentials
What describes active hyperemia in the systemic circuit?
Increased local metabolic activity results in vasodilation
CO@ binding to hemoglobin _____ oxygen unloading. Oxygen binding to hemoglobin _______ CO2 formation
Increases
Increases
If a molecule of O2 is absorbed in the lung arteriole and travles to your big toe, what does it not pass through?
Right ventricle
