Compare the structure and function of three of the following types of blood vessels: arteries, arterioles, veins, venules
and capillaries. What will be an ideal response?
Arteries and arterioles are blood vessels that transport blood away from the heart; arteries
have a larger diameter than arterioles. Veins and venules transport blood toward the heart;
veins have a larger diameter than venules. Capillaries connect the arterioles with the venules.
Capillaries have the smallest diameter of all.
Arteries and veins have a three-layered wall: an inner endothelium, a middle layer of
connective tissue and smooth muscle, and an outer layer of connective tissue. Capillaries
have walls that are only one cell thick; as a result capillaries are the only blood vessel across
which materials can pass.
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Assuming geological evidence is accurate, life on Earth may have originated ____ billion years ago
a. 14 b. 4.6 c. 3.5 d. 2.1 e. 1.2
To estimate how much the means of a variety of like samples drawn from the same population might vary, which statistic is often used and what is its formula?
What will be an ideal response?
Which of the following cells would most likely hav the greatest concentration of densely packed rough endoplasmic reticulum?
A. An amoeba engulfing small ciliates B. A bioluminescent bacterial cell C. A pancreatic cell engaged in the production of digestive enzymes D. A functional phloem cell at maturity E. An epithelial cell whose DNA is replicating before mitosis
The basement membrane in epithelial tissue
A) waterproofs the epithelium. B) provides strength and support. C) is the layer that contains the dividing cells. D) transmits nervous stimuli. E) contracts to move the skin.