In an open circulatory system, blood is _____
A) always inside of vessels and is under higher pressure than in closed circulatory systems
B) not always confined to blood vessels and is under higher pressure than in closed circulatory systems
C) always inside of vessels and is under lower pressure than in closed circulatory systems
D) not always confined to blood vessels and is under lower pressure than in closed circulatory systems
D
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Which of the following structures of the
human heart contains oxygen-rich blood?
a. right atrium b. right ventricle c. pulmonary artery d. aorta e. more than one of these structures of the human heart contains oxygen-rich blood
The earth's earliest atmosphere was likely
composed mostly of gaseous a. hydrogen. b. nitrogen. c. water vapor. d. carbon dioxide. e. mixtures of these
Plant hormonal regulation differs from animal hormonal regulation in that _____
A) there are no dedicated hormone-producing organs in plants as there are in animals B) all production of hormones is local in plants with little long-distance transport C) only animal hormone concentrations are developmentally regulated D) only animal hormones may have either external or internal receptors
Which virulence factor of Group A streptococci (GAS) is responsible for the rapid spread of tissue death in necrotizing fasciitis?
A) streptokinase B) coagulase C) coagulase and hyaluronidase D) hyaluronidase and streptokinase E) hyaluronidase