Which of the following statements clearly describes the difference between embryonic and fetal development?
Select one:
Embryonic development begins during the tenth week of gestation, a time of morphogenesis.. Organs continue to grow and develop during embryonic development.
Organs continue to grow and develop during fetal development.
Fetal development begins during the ninth month of gestation, a time of rapid growth.
Which description below explains how the hormones released in birth control pills causes natural ovulation to cease?
Select one:
Birth control pills release progesterone. Progesterone feeds back to the pituitary gland, thereby inhibiting FSH and LH and in effect, stopping the ovarian and menstrual cycle.
Birth control pills release estrogen. Estrogen feeds back to the posterior pituitary, causing an increase of LH and thereby ceasing the ovarian cycle.
Birth control pills release progesterone. Progesterone causes an increase in FSH, thereby increasing the production of follicles.
Birth control pills release estrogen. Estrogen controls the secondary sex characteristics of the female body.
5 years ago
Answered By Cassidy P
1. The difference between embryonic and fetal development is that fetal development only stars in the ninth month of gestation. The embryonic period which starts around week 3, focuses on the formation of essential parts of the brain such as hindbrain, midbrain, and forebrain. In the fourth week is where the head develops along with the mouth, nose, eyes, and ears. The cardiovascular system also starts to make the blood vessels that later become the heart. The basis for the central nervous system peripheral nervous system is developed here. The Fetal development stage marks more important stages for brain development. This is where everything from the embryonic stage develops further, and sex organs differentiate.
2. Progesterone based birth control will release progesterone. The progesterone feeds back to the pituitary gland, thereby inhibiting both FSH and LF and in effect, stopping the ovarian and menstrual cycle. Usually, the hypothalamus will detect estrogen in the body. The hypothalamus releases GnRH (gonadotropin-releasing hormone), which activates the pituitary gland. The pituitary gland and other parts of the brain that release FSH and LH, but since it is never activated, FSH and LH are inhibited. Without FSH the development of egg follicles does not occur. Since there is no LH, which usually surges to cause ovulation, there is no ovulation since there is no LH to release the eggs.
5 years ago
Answered By Cassidy P
1. The difference between embryonic and fetal development is that fetal development only stars in the ninth month of gestation. The embryonic period which starts around week 3, focuses on the formation of essential parts of the brain such as hindbrain, midbrain, and forebrain. In the fourth week is where the head develops along with the mouth, nose, eyes, and ears. The cardiovascular system also starts to make the blood vessels that later become the heart. The basis for the central nervous system peripheral nervous system is developed here. The Fetal development stage marks more important stages for brain development. This is where everything from the embryonic stage develops further, and sex organs differentiate.
2. Progesterone based birth control will release progesterone. The progesterone feeds back to the pituitary gland, thereby inhibiting both FSH and LF and in effect, stopping the ovarian and menstrual cycle. Usually, the hypothalamus will detect estrogen in the body. The hypothalamus releases GnRH (gonadotropin-releasing hormone), which activates the pituitary gland. The pituitary gland and other parts of the brain that release FSH and LH, but since it is never activated, FSH and LH are inhibited. Without FSH the development of egg follicles does not occur. Since there is no LH, which usually surges to cause ovulation, there is no ovulation since there is no LH to release the eggs.