Please answer all The hemocytoblast is considered the stem cell to all future bl

Question

Please answer all The hemocytoblast is considered the stem cell to all future blood cells. 1stare responsible for directing populations of cells down the various cell lines. The Substances, known as 74) 2nd . hemocytoblast is considered to be - Ist Differentiation inducers Differentiation inducer 2nd differentiated determined totipotent hormones hormones determined 75) The site of erythropoiesis changes during development. Fetal synthesis occurs predominantly in theand gradually shifts to thein the newborn Yolk sac, spleen and liver b) d) Spleen and liver, bone marrow a) Yolk sac, bone marrow e) Bone marrow, yolk sac c) Spleen and liver, yolk sac 76) Which of the following statements about peptide or protein hormones is usually true? A. They have longer half-lives than steroid hormones B. they have receptors on their target cell membrane C. they require protein carriers in the plasma D. they are not stored in endocrine-producing glands. 77) A 40-year old woman is placed on a high-potassium diet for several weeks. Which of the following hormonal changes is most likely to occur? A. increased secretion of dehydroepiandrosterone (DHEA) B. increased secretion of aldosterone C. increased secretion of cortisol D. increased secretion of adrenocorticotropic hormone E. decreased secretion of corticotropin releasing hormone 78) A woman is taking birth-control pills with a high amount of estrogen and progesterone. best explains why her ENDOGENOUS HPG axis would have low amounts of GnRH, low FSH What and LH, and low estrogen and progesterone release A. Negative feedback inhibition B. Failure of negative feedback inhibition C. Failure of positive feedback inhibition D. positive feedback inhibition E. She should just get pregnant so I don't have to figure this out. 71

Explanation / Answer

Answer 74. Differentiation, differentiated (pleuripotent)

Haemocytoblasts are the pleuripotent cells that forms various types of blood cells.

Answer 75. Option b

Yolk sac is meant for erythropoiesis innfetis whereas bonemarrow which is the cavity of long bones is meant for erythropoiesis after birth.

Answer 76. Option d

All the other options are meant for steroid hormones like they have half life of hours, they bind to a receptor and require protein carrier.

Answer 77. Option c

Deficiency of cortisol produces Cushing syndrome. It is produced by adrenal cortex.

Answer 78. Option a

Oral contraceptives inhibit the LH and FSH by negative feedback mechanism. Inhibiting ovulation.

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