Answer the following question given this paragraph: Role of Feedback Loops The contribution of feedback loops to homeostasis will only be briefly reviewed here. Positive feedback loops are characterized by the release of additional hormone in response to an original hormone release. The release of oxytocin during childbirth is a positive feedback loop. The initial release of oxytocin begins to signal the uterine muscles to contract, which pushes the fetus toward the cervix, causing it to stretch. This, in turn, signals the pituitary gland to release more oxytocin, causing labor contractions to intensify. The release of oxytocin decreases after the birth of the child. The more common method of hormone regulation is the negative feedback loop. Negative feedback is characterized by the inhibition of further secretion of a hormone in response to adequate levels of that hormone. This allows blood levels of the hormone to be regulated within a narrow range. An example of a negative feedback loop is the release of glucocorticoid hormones from the adrenal glands, as directed by the hypothalamus and pituitary gland. As glucocorticoid concentrations in the blood rise, the hypothalamus and pituitary gland reduce their signaling to the adrenal glands to prevent additional glucocorticoid secretion (Figure 17.6). Q: By allowing blood levels of a hormone to be regulated within a narrow range, feedback loops contribute to maintaining what state? Choices: - hypothesis - hibernation - consciousness - homeostasis A:
homeostasis
Answer the following question given this paragraph: The age-sex structure of a population is the number of individuals of each sex and age in the population. Age-sex structure influences population growth. It is represented by a population pyramid. The number of survivors at each age is plotted on a survivorship curve. Q: What helps represent age-sex structure of the population? Choices: - habitat chart - density graph - biome model - population pyramid A:
population pyramid
Q: Answer the following question given this paragraph: Nearsightedness, or myopia, is the condition in which nearby objects are seen clearly, but distant objects appear blurry. The eyeball is longer than normal, focusing images front of the retina. Concave lenses can correct the problem. Q: What type of lenses can correct myopia? Choices: - polarized lenses - diffusion lenses - convex lenses - concave lenses A:
A: concave lenses
Question: Answer the following question given this paragraph: Our Sun is a star , a sphere of plasma held together by gravity. It is an ordinary star that is extraordinarily important. The Sun provides light and heat to our planet. This star supports almost all life on Earth. Q: What is a buildup of electric charges on objects? Choices: - wattage - potential - conduction - static A:
Answer: static
*Question*
Answer the following question given this paragraph: The nucleolus, which makes ribosomes, is also within the nucleus. Q: The nucleolus, which makes ribosomes, is located within what cell structure? Choices: - mitochondria - Golgi apparatus - epidermis - nucleus A:
**Answer**
nucleus
Answer the following question given this paragraph: An ionic bond is electrostatic in nature. Q: What is an ionic bond in nature? Choices: - magnetic - radioactive - kinetic - electrostatic A:
electrostatic