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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For the hierarchy of skeletal muscle organization, which accurately lists the order of structures from "small" to "big"?
A. sarcomere, myofibril, muscle fiber, motor unit B. myofibril, muscle fiber, sarcomere, motor unit C. motor unit, myofibril, muscle fiber, sarcomere D. motor unit, sarcomere, muscle fiber, myofibril E. None of the choices are correct.
Sponges have two true tissue layers
____________________ Indicate whether the statement is true or false.
sodium helps to regulate pH and _______ balance in the body
Fill in the blank(s) with the appropriate word(s).
Chiasmata (or chiasma) provide evidence of
A) meiosis. B) chromosomal aberration. C) fertilization. D) spindle fiber formation. E) crossing over.