Which of the following is not true about prolactin in female rats? O a. It helps trigger the luteinizing hormone surge. b. Its secretion is stimulated by intromission. c. It plays a role in the activation of maternal behavior. d. Its levels in pregnant females rise shortly before parturition (giving birth). Oe. It has stimulatory effects on corpora lutea. QUESTION 2 Which of the following is not true about progesterone in female rats? Oa lt helps trigger the luteinizing hormone surge. Ob.It helps activate sexual behavior. Oc.It inhibits sexual behavior. Od.It inhibits maternal behavior. Oe. Its levels in pregnant females rise shortly before parturition (giving birth).

Which of the following is not true about prolactin in female rats? O a. It helps trigger the luteinizing hormone surge. b. Its secretion is stimulated by intromission. c. It plays a role in the activation of maternal behavior. d. Its levels in pregnant females rise shortly before parturition (giving birth). Oe. It has stimulatory effects on corpora lutea. QUESTION 2 Which of the following is not true about progesterone in female rats? Oa lt helps trigger the luteinizing hormone surge. Ob.It helps activate sexual behavior. Oc.It inhibits sexual behavior. Od.It inhibits maternal behavior. Oe. Its levels in pregnant females rise shortly before parturition (giving birth).

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter16: The Body's System

Section: Chapter Questions

Problem 18RQ: What is the function of the hormone erythropoietin? a. stimulates production of red blood cells b....

See similar textbooks

Similar questions

Researchers measured prolactin and growth hormone in the blood plasma of six subjects at regular intervals over a 24-hour period. The investigators were interested in determining if the levels of these two hormones cycle over a 24-hour period. The Figure presents the results of their experiments, with the y axis values showing the amount of each hormone expressed as a percentage of the 24-hour mean value, and each point showing the average of the six subjects levels. FIGURE Mean concentrations of prolactin and growth hormone in plasma, averaged for six subjects and expressed as a percentage of the average concentrations measured for the 24-hour period. Do the results support the hypothesis that the changes in prolactin level over a 24-hour period are associated with the sleepwake cycle? Source: From J. F. Sassin et al. 1972. Human prolactin: 24-hour pattern with increased release during sleep. Science 177:12051207.
The hormone insulin enhances the transport of glucose (sugar) from the blood into most body cells. Its secretion is controlled by a negative-feedback system between the concentration of glucose in the blood and the insulin-secreting cells. Therefore, which of the following statements is correct? A decrease in blood glucose concentration stimulates insulin secretion, which in turn further towers blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn lowers blood glucose concentration. A decrease in blood glucose concentration stimulates insulin secretion, which in turn increases blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn further increases blood glucose concentration. None of the preceding is correct.
A cell secretes a product that diffuses through the interstitial fluid and acts on nearby cells. This process is an example of (a) neuroendocrine secretion (b) autocrine signaling (c) paracrine signaling (d) classical endocrine regulation (e) peptide hormone function
A scientist hypothesizes that the pancreas’s hormone production is controlled by neural stimuli. Which observation would support this hypothesis? Insulin is produced in response to sudden stress without a rise in blood glucose Insulin is produced in response to a rise in glucagon levels Beta cells express epinephrine receptors Insulin is produced in response to a rise in blood glucose in the brain.
How do hormones compare structurally and functionally in invertebrates and vertebrates?
Describe how hormone receptors can play a role in affecting the size of the responses of tissues to hormones.
Visit this link (http://openstaxcollege.org/l/hormonebind) to watch an animation of the events that occur when a hormone binds to a cell membrane receptor. What is the secondary messenger made by adenylyl cyclase during the activation of liver cells by epinephrine?
Figure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estrogen are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.
Identify the classical vertebrate endocrine glands and describe the actions of their hormones; describe the effects of hypersecretion and hyposecretion on homeostasis.
A hormone molecule binds to a receptor on a cell membrane. It doesnt enter the cell; rather, the binding activates a second messenger inside the cell that triggers an amplified response to the hormonal signal. Is the signaling molecule a steroid or a nonsteroid hormone?
Visit this link (http://openstaxcollege.org/l/roleofhypo) to watch an animation showing the role of the hypothalamus and the pituitary gland. Which hormone is released by the pituitary to stimulate the thyroid gland?
Secretion of the hormone ADH may decrease or stop if the pituitarys posterior lobe is damaged, as by a blow to the head. This is one cause of diabetes insipidus. People with this form of diabetes excrete so much dilute urine that they may become seriously dehydrated. Where are the target cells of ADH?