Answer the following question given this paragraph: pressure and maintaining blood flow. Ultimately, however, blood volume will need to be restored, either through physiological processes or through medical intervention. In response to blood loss, stimuli from the baroreceptors trigger the cardiovascular centers to stimulate sympathetic responses to increase cardiac output and vasoconstriction. This typically prompts the heart rate to increase to about 180200 contractions per minute, restoring cardiac output to normal levels. Vasoconstriction of the arterioles increases vascular resistance, whereas constriction of the veins increases venous return to the heart. Both of these steps will help increase blood pressure. Sympathetic stimulation also triggers the release of epinephrine and norepinephrine, which enhance both cardiac output and vasoconstriction. If blood loss were less than 20 percent of total blood volume, these responses together would usually return blood pressure to normal and redirect the remaining blood to the tissues. Additional endocrine involvement is necessary, however, to restore the lost blood volume. The angiotensin-reninaldosterone mechanism stimulates the thirst center in the hypothalamus, which increases fluid consumption to help restore the lost blood. More importantly, it increases renal reabsorption of sodium and water, reducing water loss in urine output. The kidneys also increase the production of EPO, stimulating the formation of erythrocytes that not only deliver oxygen to the tissues but also increase overall blood volume. Figure 20.21 summarizes the responses to loss of blood volume. Q: Sympathetic stimulation also triggers the release of epinephrine and norepinephrine, which enhance both cardiac output and what else? Choices: - vasodilation - inhibition - digestion - vasoconstriction A:
vasoconstriction
(Question)
Answer the following question given this paragraph: The endocrine system consists of glands that secrete hormones into the bloodstream. It is regulated by a part of the brain called the hypothalamus, which also secretes hormones. The hypothalamus controls the pituitary gland, which is called the "master gland" of the endocrine system because its hormones regulate other endocrine glands. Other endocrine glands include the thyroid gland and pancreas. Q: What specific part of the brain regulates the endocrine system? Choices: - parietal lobe - hippocampus - frontal lobe - hypothalamus A:
(Answer)
hypothalamus
Ques: Answer the following question given this paragraph: All of the populations that live in the same area make up a community . The community that includes the goldfish population also includes the populations of other fish, coral and other organisms. Q: The populations that live in the same area form this? Choices: - a colony - a habitat - a biome - a community A:
Ans: a community
(Q).
Answer the following question given this paragraph: Another common dilution problem involves deciding how much of a highly concentrated solution is requires to make a desired quantity of solution of lesser concentration. The highly concentrated solution is typically referred to as the stock solution. Q: What is a high concentrated solution typically referred to as? Choices: - percent solution - saline sollution - share solution - stock solution A:
(A).
stock solution
Ques:Answer the following question given this paragraph: Advection fog is famous in San Francisco, California. Warm, moist air comes in from the Pacific Ocean. The air blows over the cold California current. When the air cools below its dew point, fog forms. Sea breezes bring the fog onshore. Q: What forms after air cools below its dew point? Choices: - sleet - smoke - plasma - fog A:

Ans:fog
Ques:Answer the following question given this paragraph: The first year after birth is called infancy . Infancy is a period when the baby grows very fast. During infancy, the baby doubles in length and triples in weight. Other important changes also happen during infancy:. Q: What is first year after birth is called? Choices: - adolescence - primary stage - neonatal stage - infancy A:

Ans:
infancy