Where is your ilium?
a. part of the knee
b. part of the pelvic girdle
c. part of the cranium
d. part of the pectoral girdle
e. in the foot
B
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Which scenario is an example of positive feedback?
a. When oxygen levels are low, the kidneys secrete erythropoietin, which stimulates the proliferation and differentiation of red blood cells until oxygen demands are met. b. As blood pressure increases, specialized neurons relay the change to the brainstem, which in turn, decreases the contractility of the heart and leads to vasodilation, thereby decreasing blood pressure. c. After an injury, chemicals released at the site of injury will activate platelets, which will in turn activate additional platelets, and so on, until the clot has formed and the injury is no longer bleeding. d. When stress levels are high, the hypothalamus secretes corticotropin-releasing hormone (CRH), which in turn stimulates the secretion of adrenocorticotropic hormone (ACTH), which then triggers the release of cortisol. Increased cortisol levels then inhibit the release of CRH and ACTH. e. After eating, when glucose levels are high, insulin levels increase, leading to an increase in glycogen and fat synthesis to remove excess glucose from circulation.
The largest reservoir of water is the ____
a. oceans b. polar ice and glaciers c. groundwater d. lakes and rivers e. atmosphere
When a nerve impulse travels from neuron 1 to neuron 2, neuron 1 is known as the _____
a. postsynaptic neuron b. presynaptic neuron c. synapse d. gated channel e. dendrite
You would like to know if two populations of fish are reproductively isolated and thus different species, according to the biological species concept. Which of the following would provide evidence for a prezygotic barrier to reproduction?
A. The populations form viable offspring, but the offspring are less fit. B. a hybrid fetus never reaches term C. Cell surface proteins of one species eggs prevent sperm from another species attaching, so the sperm cannot fertilize it. D. One is usually found on the south side of the lake while the other is found on the north side