In which layer of the epidermis are lamellar bodies formed inside keratinocytes?
A. stratum corneum
B. stratum spinosum
C. stratum granulosum
D. stratum basale
E. stratum lucidum
B
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The absolute refractory period of an excitable membrane roughly corresponds to the period when sodium channels are opening and inactivated.
Answer the following statement true (T) or false (F)
The function of the coronary sinus is to
A. connect the top and bottom halves of the heart. B. guide the aorta out of the heart. C. guide the inferior vena cava into the right atrium. D. take blood from the coronary circulation to the right atrium. E. shunt blood from the right atrium to the left atrium.
Parathyroid hormone (PTH)
A. stimulates reabsorption of both calcium and phosphate. B. stimulates reabsorption of calcium but inhibits phosphate reabsorption. C. inhibits reabsorption of calcium but stimulates phosphate reabsorption. D. inhibits reabsorption of both calcium and phosphate.
Chief cells secrete
A) mucus. B) intrinsic factor. C) hydrochloric acid. D) pepsinogen. E) gastrin.