The youngest keratinocytes are found in the stratum basale.
Answer the following statement true (T) or false (F)
True
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If a person stands up suddenly from the prone (lying) position they may feel a sudden dizzy or lightheadedness. Which of the following is the least likely physiological response to this situation?
A) increased sympathetic output to the heart B) faster heart rate and greater heart contractility C) increased parasympathetic nerve impulses to the heart D) increasing peripheral resistance due to vasoconstriction
Describe the progression of a fertilized egg, from totipotent cell through pluripotent and multipotent stem cells. How might stem cells be of therapeutic value? What is plasticity?
What will be an ideal response?
Which of the following are common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response?
a. opening or closing of specific channels to regulate ionic movement across the plasma membrane. b. activation of an intracellular second messenger system. c. alteration of protein shape and function as a result of phosphorylation. d. only (a) and (b) above. e. all of these answers.
The sympathetic nerve supply of the stomach arises from which of the following cord segments?
(A) T1-T5 (B) T6-T9 (C) T6-T12 (D) L1-L3 (E) T10-L2