What is true about the lymphatic system?
A. It exhibits peristaltic contractions.
B. Fluid moves through the lymphatic system under high pressure.
C. It carries all absorbed materials from the stomach and intestines to the liver.
D. It is bi-directional.
E. It collects fluid that seeps into the tissues and returns it to the blood.
E. It collects fluid that seeps into the tissues and returns it to the blood.
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A pharmaceutical company is attempting to develop a new drug. An expected outcome of the development process will be monitoring of the new drug by the:
a. Drug Enforcement Agency (DEA) b. Food and Drug Administration (FDA) c. National Institutes of Health (NIH) d. United States Pharmacopeia (USP)
Which of the following is NOT a characteristic of most animals?
A. They have Hox genes. B. They are heterotrophic. C. They have an extracellular matrix of proteins such as collagen. D. They have cell walls. E. They have a nervous system.
Which organisms contain the smallest, least complex cell types?
A. Animals B. Fungi C. Plants D. Bacteria
During embryonic development, animal cells must divide and differentiation to determine what?
a. morphology and anatomy b. anatomy and physiology c. morphology and physiology d. analogy and homology