90. What organ controls the production of red blood cells? A. Heart B. Kidney C.
ID: 180434 • Letter: 9
Question
90. What organ controls the production of red blood cells? A. Heart B. Kidney C. Hypothalamus. D. Bone Marrow E. Spleen. provide nutrient molecules for growing embryos before the true leaves begin photosynthesizing. A. Flowers. B. Roots. C. Leaflets. D. Sclerenchyma cells, E. Cotyledons 92. What organ is both endocrine and exocrine gland? A. Hypothalamus B. Pancreas. C. Pituitary. D. Placenta E. All of the above 93. What can cause goiter to develop in a person? A. Too much cold weather. B. Excessive thyroxine production. C. Cretinism D. Too little iodine production. E. Excessive calcitonin 94. Chemicals for insect communication are called A. Ecdy sones. B. Proto sones C. Pheromones D. Deutrostomes E. None of the above. 95. Which of the following is a false statement about innate immunity? A They must be by the ofantigens. B They include inflammatory responses. C. and natural killer cells are participants in the process. D. They may involve the formation of membrane E. They include physical and chemical barriers.Explanation / Answer
Answer:
90). B. Kidney
Erythropoietin is produced in the kidney and liver in response to low oxygen levels. In addition, erythropoietin is bound by circulating red blood cells; low circulating numbers lead to a relatively high level of unbound erythropoietin, which stimulates production in the bone marrow.
91). E. Cotyledons
Cotyledons are considered as seed leaves that provide nutrient molecules for seedlings before true leaves begin photosynthesizing.
92). D. Pancreas
Pancreas can synthesize hormones and enzymes so it is considered as endocrine and exocrine glands respectively.
93). B. excessive thyroxine production
A goiter can sometimes occur when your thyroid gland produces too much thyroid hormone (hyperthyroidism).
94). C. Pheromones
Pheromones are the chemical messages that insects use to communicate with other members of the same species. Sex pheromones are used to attract insects of the same species for mating. Aggregation pheromones are used to send out messages to many insects within one species.
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