Labour is controlled by the nervous and endocrine systems through a positive feedback system. In which example have we encountered another positive feedback system in Biology 30? a. Reflex loop in the PNS b. FSH levels during sperm production c. Progesterone during menstruation d. Prolactin during lactation

Labour is controlled by the nervous and endocrine systems through a positive feedback system. In which example have we encountered another positive feedback system in Biology 30? a. Reflex loop in the PNS b. FSH levels during sperm production c. Progesterone during menstruation d. Prolactin during lactation

Ebk:Nutrition & Diet Therapy

10th Edition

ISBN:9780357391747

Author:DEBRUYNE

Publisher:DEBRUYNE

Chapter11: Nutrition Through The Life Span: Pregnancy And Lactation

Section: Chapter Questions

Problem 10SC

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Which hormone is primarily responsible for the contractions during labor? a. oxytocin b. estrogen c. -HCG d. progesterone
Labour is controlled by the nervous and endocrine systems through a positive feedback system.In which example have we encountered another positive feedback system in Biology 30? Select one: a. Progesterone during menstruation b. Estrogen during ovulation c. FSH levels during sperm production d. Reflex loop in the PNS
The pituitary gland then releases a large amount of on day 14 that causes O A. progesterone; contractions in the uterus O B. luteinizing hormone (LH); the egg to be released from the ovary O C estrogen; ovulation O D. follicle stimulating hormone (FSH), an egg to grow
Describe if each of the following mechanisms is regulated by positive or negative feedback. neanive 1. When you are hot, you sweat and your blood vessels dilate. As your body cools, you sweat less your blood vessels return to normal. 2. When blood clots, more and more platelets rush to the area 3. When a baby is born, the uterus contracts more often and more forcefully until the baby is born. 4. Blood sugar is regulated by insulin. As blood sugar returns to normal, less insúlin is produced. 5.When you are cold, your blood vessels constrict and your muscles shiver. As your body returns to normal, you cease shivering and your blood vessels restore normal blood flow. 6.After pregnancy, the suckling of an infant causes an increase in milk production.
Which of the following is an example of negative feedback?a. Uterine contractions increase as labor progresses.b. Insulin decreases blood sugar levels after a meal is eaten.c. Sweating increases as body temperature drops.d. Platelets continue to plug an opening in a blood vessel untilblood fl ow stops.
direction: Choose the correct answer in each question. 1. A decrease in body temperature causes a decrease in metabolism, which causes less heat to be generated, which causes the body temperature to decrease even more. This physiological event represents what type of feedback mechanism? Select one: a. Neutral Feedback b. Feedforward Feedback c. Positive Feedback d. Negative Feedback 2. Which hormone is produced by the testes? Select one: a. Progesterone b. Testosterone c. Inhibin d. Estrogen 3. This nutrient can also be used as an energy source but the body mainly uses this as building materials for cell structures and as enzymes, hormones, parts of muscles, and bones. Which of the following nutrient is found in dairy products, poultry, fish, meat, and grains? Select one: a. Amino acid b. Carbohydrate c. Proteins d. Fats 4. This nutrient can also be used as an energy source but the body mainly uses this as building materials for cell structures and as enzymes,…
How does the decrease in progesterone at the last weeks of pregnancy help to bring on labor?a. stimulating FSH productionb. decreasing the levels of estrogensc. dilating the cervixd. decreasing the inhibition of uterine contractility
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.
Which hormone causes FSH and LH to be released? a. testosterone b. estrogen c. GnRH d. progesterone
A study divides healthy females into two groups (A and B). Both groupsare composed of those who have been sexually active for at least 2 yearsand are not pregnant at the beginning of the experiment. The subjectsweigh about the same amount, and none smoke cigarettes, althoughsome drink alcohol occasionally. Group A individuals receive a placeboin the form of a sugar pill each morning of their menstrual cycles. GroupB individuals receive a pill containing estrogen and progesterone eachmorning of their menstrual cycles. Then plasma LH levels are measuredbefore, during, and after ovulation. The results are as follows:Group 4 Days BeforeOvulationDay ofOvulation4 Days AfterOvulationA 18 mg/100 mL 300 mg/100 mL 17 mg/100 mLB 21 mg/100 mL 157 mg/100 mL 15 mg/100 mLThe number of pregnancies in group A is 37/100 females/year. Thenumber of pregnancies in group B is 1.5/100 females/year. Whatconclusion can you reach on the basis of these data? Explain themechanism involved.
Design another experiment to determine whether the signalthat controls male development is a hormone. Make sureto identify your hypothesis, prediction, data collection plan,and controls
Estradiol is found in high levels in the pregnant rat. This estradiol is prevented from affecting the development of the fetus because: a. it is chemically converted to testosterone, which does not affect the fetus b. it is bound by alpha-fetoprotein c. the blood-brain barrier keeps estrogens like estradiol out of the brain d. the fetus does not possess the estrogen receptors needed to respond to the estradiol