Blood enters into what structure in the heart from the superior and inferior vena cavae?
A. Right atrium
B. Left ventricle
C. Left atrium
D. Right ventricle
Answer: A
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Which organelle is more prominent in cells that make large amounts of protein?
A) nucleus B) nucleolus C) chromosome D) proteasome E) mitochondria
Which of the following is NOT a contribution of the cardiovascular system to other body systems?
a) Blood delivers clotting factors and WBCs that aid in hemostasis when skin is damaged. b) Blood delivers calcium and phosphate ions that are needed for building bone extracellular matrix. c) Blood carries carbon dioxide to body tissues and removes oxygen for use by other organs. d) Blood carries newly absorbed nutrients and water to the liver. e) Blood circulates cells and chemicals that carry out immune functions.
What is the role of reticular cells in the bone marrow?
A. They give rise to all formed elements of the blood. B. They destroy malformed blood cells. C. They produce thymosin. D. They secrete colony-stimulating factors. E. They produce antibodies.
The pH of a solution increases as the ________ ion concentration decreases.
A. hydrogen B. bicarbonate C. hydroxide D. sodium