The hepatic portal vein carries blood away from the
A) digestive tract.
B) kidneys.
C) pancreas.
D) spleen.
E) liver.
A) digestive tract.
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The transparent anterior portion of the eye is called the
A) cornea. B) retina. C) conjunctiva. D) lens. E) choroid.
Bones
A) do not contribute to homeostasis. B) are not living tissue. C) have a matrix composed mostly of organic salts. D) are multifunctional.
Which organ system excretes nitrogenous wastes?
A. The respiratory system B. The urinary system C. The digestive system D. The integumentary system E. The cardiovascular system
What are the two main atoms in lipids, and what type of bonds connect them?
A. carbon and oxygen, connected by covalent bonds. B. carbon and hydrogen, connected by covalent bonds C. carbon and hydrogen, connected by ionic bonds D. carbon and hydrogen, connected by hydrogen bonds E. oxygen and hydrogen, connected by hydrogen bonds