13) The reproductive cycle of plainfin midshipman fish is under seasonal hormona

Question

13) The reproductive cycle of plainfin midshipman fish is under seasonal hormonal control. Which one of the following experiments supports this statement? emale midshipman fish caught in winter respond to recorded male courtship songs. b. Injection of estrogen and testosterone in females during the winter, increases ovarian function and allows females to respond to recordings of male courtship song recordings. c. Injection of estrogen and testosterone in fe d. Seasonal increases in k bladder to atrophy so they can't sing to females male midshipman fish promotes sperm production eto-testosterone in male midshipman fish cause sonic muscles of the swim 14) Which ONE of the following terms describes the type of signaling that occurs when insulin is released from pancreatic beta cells? a. endocrine b. paracrine c. autocrine d. neurotransmission 15) Which of the following events does NOT occur in insulin signaling? a. insulin binding to insulin receptors triggers membrane insertion of glucose transporters b. Insulin is released when blood glucose levels drop c. Insulin causes glucose uptake in the liver d. The effect of insulin on blood glucose levels is antagonized by glucagon

Explanation / Answer

13) Male midshipman fish attract females using acoustic signals. The tuning at the level of the inner ear of females is modified seasonally by steroid hormones and detect the upper harmonics of male's advertisement 'hum',during the breeding season(spring/summer) than when the females are in non-reproductive state (winter).

14) The pancreas is a dual-functional gland, with both exocrine (digestive) and endocrine (hormonal) functions. The function of endocrine involves the secretion of insulin produced and released by pancreatic beta cells.

15) Insulin is released by the pancreatic beta cells in response to high blood glucose levels. Answer is option (b).

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