Dendritic or Langerhans cells:
a. contain melanin
b. are epidermal stem cells
c. add strength to the epidermis
d. help provide immunity
Answer: d. help provide immunity
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The ABO blood group is based on which antigen(s)?
A) antigen Rh B) antigens A and B C) antigen O D) antigen D
Which is true of vesicular transport from the cell interior across plasma membranes?
1.It requires no energy input. 2.The transported substances diffuse through membrane pores. 3.The transported substance is enclosed in a membrane-wrapped organelle that fuses with the plasma membrane. 4.It is also known as endocytosis. 5.The transported substance is attached to carrier proteins in the plasma membrane.
The venom of certain snakes contains substances that activate factors V, IX, and X. Which of the following effects would occur if exposed to human blood?
a) Venom would increase thrombolysis b) Venom would decrease thrombolysis c) Venom would increase platelet plug formation d) Venom would increase coagulation
________ are chemical messengers secreted in the bloodstream and stimulate physiological responses in distant organs.
Fill in the blank(s) with the appropriate word(s).