Which type of cartilage is dense and very resistant to stretching?
a. hyaline cartilage
b. costal cartilage
c. elastic cartilage
d. fibrocartilage
d
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A 30-year-old man is referred to a gastroenterologist for evaluation of persistent dyspepsia (indigestion)
He is noted to have other symptoms, including flushing and hypotension, and following a bone marrow biopsy, is diagnosed with systemic mastocytosis (an excessive proliferation of histamine-containing mast cells). An increased propensity for gastric and duodenal ulcers in this patient is likely ascribable to overproduction of which of the following second messengers in gastric parietal cells? A. calcium B. inositol trisphosphate C. diacyglycerol D. cGMP E. cAMP
Glucagon:
a. is released by pancreatic beta cells b. accelerates liver glycogenolysis c. causes a drop in blood glucose levels d. all of the above
What are the four types of sensory receptors for the general senses? What is the nature of the stimuli that excite each type?
A threshold potential is
a. the potential achieved when two opposing forces acting upon an ion (concentration and electrical gradients) achieve a state of equilibrium b. the peak potential achieved during an action potential c. the point at which there is an explosive increase in Na+ or Ca2+ permeability d. the potential at which K+ permeability increases e. always a positive potential