33. List the hormones produced by the placenta. 34. List the substances that can
ID: 3515654 • Letter: 3
Question
33. List the hormones produced by the placenta. 34. List the substances that can pass through the placental barriers. 35. What are the functions of placental hormone human chorionic somatomammotropin (hCS)?. 36. What developmental events occur during weeks 9-12, 13-16, 17-20,21-30, and 30-40 of fetal development? 37. List and briefly describe the three stages of labor. Which stage is the longest part of labor? 38. The primary reproductive organ in the human female is the 39. The primary reproductive organ in the human male is the 40. What two systems are first to become evident during embryonic development? What is the time span for limb bud differentiation? 41. What time frame represents the human embryonic period of development? 42. In which structure of the male reproductive system does sperm maturation take place? 43. Define/describe each of the extraembryonic membranes. 44. List the functions of the trophoblasts Chapter 29 45. List the three sources of genetic variation. 46. Define identical/monozygotic and fraternal/dizygotic twins. 47. Recessive genes are usually expressed in humans only when 48. One possible scientific explanation for siblings having very different skin color is 49. An example of multiple allele inheritance is 50. List and describe the disorders that are a result of nondisjunction of sex chromosomes during meiosis (only those covered in this course). 51. List the characteristics of Down's syndrome (both modes of inheritance). 52. In a paternity suit, the man has blood type AB. He could not be the father if the child has what blood type?Explanation / Answer
33) The placenta is only present during pregnancy. It produces human chorionic gonadotropin, progesterone, estrogen, and human placental lactogen.
34) Red blood cell antigens, carbon dioxide, oxygen, some viruses, and nutrients can pass through placenta.
35) Human chorionic somatomammotropin (hCS) is a placental hormone. Its function is similar to human growth hormone. The major role is to promote fetal growth by stimulating amino acid uptake and DNA synthesis.
36) Developmental events occur during fetal development:
9-12 Weeks: Blood cell formation begins in bone marrow and sex organs developed.
13-16 Weeks: Cerebellum becoming prominent; eyes and ears developed, blinking of eyes and sucking motion of lips occur and face looks like human and whole body develops during this stage.
17-20 Weeks: Fetal position is restricted due to space restrictions and mother feels spontaneous muscular activity of fetus.
21-30 Weeks: Substantial increase in weight and myelination of spinal cord begins, eyes are open
30-40 Weeks: Skin color change and fat is laid down in subcutaneous tissue (hypodermis). The weight reaches around ~6-10 pounds.
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