Ques: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:

Ans:vasoconstriction
-----
Ques:Answer the following question given this paragraph: Figure 27.15 Hormone Levels in Ovarian and Menstrual Cycles The correlation of the hormone levels and their effects on the female reproductive system is shown in this timeline of the ovarian and menstrual cycles. The menstrual cycle begins at day one with the start of menses. Ovulation occurs around day 14 of a 28-day cycle, triggered by the LH surge. Q: What process occurs around day 14 of a 28-day menstrual cycle, triggered by the lh surge? Choices: - sedimentation - fertilization - menstruation - ovulation A:

Ans:ovulation
-----
Ques:Answer the following question given this paragraph: In species with sexual reproduction, each cell of the body has two copies of each chromosome. For example, human beings have 23 different chromosomes. Each body cell contains two of each chromosome, for a total of 46 chromosomes. You can see the 23 pairs of human chromosomes in Figure below . The number of different types of chromosomes is called the haploid number. In humans, the haploid number is 23. The number of chromosomes in normal body cells is called the diploid number. The diploid number is twice the haploid number. In humans, the diploid number is two times 23, or 46. Q: In species with sexual reproduction, each cell of the body has two copies of each what? Choices: - cell - rna strand - dna strand - chromosome A:

Ans:chromosome
-----
Ques:Answer the following question given this paragraph: Photosynthesis ceases when leaves wilt, mainly because. Q: When leaves wilt, what plant process ceases? Choices: - hydration - reactions - carbonation - photosynthesis A:

Ans:
photosynthesis
-----