24. All of the following occur at +30mV in an axon EXCEPT: a. the axolemma becomes hyperpolarized c. inactivation gates of voltage-gated sodium channels close b. voltage-gated potassium channels open d. Na+ / K+ ATPase pumps 3 sodium out and 2 potassium in 25. Grave’s disease can lead to all of the following EXCEPT: 26. The releasing and inhibiting hormones secreted from the neurosecretory cells of the hypothalamus eventually exit the hypophyseal portal system from the: 27. Thrombin converts circulating fibrinogen to fibrin: 28. All of the following contain oxyhemoglobin EXCEPT: a. the chamber of the heart inferior to the bicuspid valve c. first vessel branching off of the ascending aorta b. coronary sinus d. pulmonary vein 29. The autonomic nervous system is composed of __________ neurons that propagate their information ____________:
30. Contractions of the papillary muscles: 31. Which of the following is never present in the primary capillary plexus of the median eminence: 32. After a repolarization event, a neuron generally becomes hyperpolarized due to current flowing through: a. voltage-gated sodium channels c. ligand-gated chloride channels b. potassium leak channels d. voltage-gated potassium channels 33. All of the following are true regarding platelets EXCEPT: 34. Elevated plasma levels of ____________ can ____________ feedback on the neurosecretory cells of the hypothalamus and stimulate the release of __________:
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