Which is the proper order of the components of the electrical activity of the heart?
a. AV node ? Purkinje fibers ? SA node
b. AV node ? SA node ? Purkinje fibers
c. Purkinje fibers ? AV node ? SA node
d. Purkinje fibers ? SA node ? AV node
e. SA node ? AV node ? Purkinje fibers
E
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The type of vaginitis referred to as bacterial vaginosis is thought to be caused by:
a. Gardnerella vaginalis. b. S. agalactiae. c. Lactobacillus spp. d. Enterococcus spp.
What is the difference between mutualism and synergism?
A. In a synergistic relationship, both organisms benefit, but in a mutualistic relationship both organisms are harmed. B. In a mutualistic relationship, the organisms are dependent upon each other. C. In a synergistic relationship, the organisms cannot survive without each other. D. In a mutualistic relationship, both organisms benefit, but in a synergistic relationship both organisms are harmed.
Answer the following statements true (T) or false (F)
1.Estrogen is a male sex hormone. 2.Follicle-stimulating hormone (FSH) is only found in females. 3.Birth control pills only contain estrogen. 4.Sea urchins display external fertilization. 5.Fruit fly development expression of the bicoid gene on one end of the embryo is necessary for proper head positioning.
The two broad classes of cells in the nervous system include 1. those responsible for information processing, and 2. those providing mechanical and metabolic support.These two categories of specialized cells are called
A. microglia and Schwann cells. B. Schwann cells and glial cells. C. neurons and glial cells. D. neurons and fibrocytes. E. astrocytes and Schwann cells.