When blood is centrifuged, what is found in the buffy coat?
A) plasma and leukocytes B) platelets and leukocytes
C) leukocytes and erythrocytes D) erythrocytes and platelets
Answer: B
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During in utero (fetal) development of the ovary, which of these occurs?
A. Cell division of primary oogonia results in the production of 2 to 4 million primary oocytes, which are present at birth. B. A single primary oogonium remains dormant, which then undergoes rapid mitosis after birth. C. Cell division of primary oogonia, which all complete both meiotic divisions before birth. D. The mitotic division of primary and secondary oocytes produces cells with 23 chromosomes each. E. Cell division of primary oogonia, which all complete the first meiotic division before birth.
A group of students has declared a hunger strike to protest a perception of low-quality dorm food. Jose is one of the protesting students and he has not eaten for three days. A blood test reveals that there are high levels of ketones in Jose's blood. These ketones
A. are converted to fatty acids and released into the blood. B. can be used by the brain as an energy source. C. are used to synthesize glucose by gluconeogenesis. D. are a waste product of amino acid metabolism that the kidneys must excrete. E. are a by-product of anaerobic metabolism.
The cells responsible for bone growth and repair are called ________
A) bone marrow B) osteocytes C) osteoblasts D) periosteum
In the sympathetic division, the preganglionic neuron is
A. Short and the postganglionic neuron is longer B. Short and the postganglionic neuron is shorter. C. Long and the postganglionic neuron is short. D. Long and the postganglionic neuron is longer