Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

44. Animal Reproduction

Animal Reproduction

General Biology

44. Animal Reproduction

Animal Reproduction

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3:10 minutes

Problem 4

Textbook Question

True or false: The corpus luteum is retained upon implantation due to the presence of the hormone human chorionic gonadotropin (hCG).

Verified step by step guidance

Step 1: Understand the terms in the question. The corpus luteum is a temporary endocrine structure in female ovaries that is involved in the production of relatively high levels of progesterone, moderate levels of estradiol, and inhibin A. Human chorionic gonadotropin (hCG) is a hormone produced primarily in the placenta during pregnancy.

Step 2: Recall the role of the corpus luteum. After ovulation, the corpus luteum forms from the follicle that released the egg. It produces hormones, particularly progesterone, which prepares the uterus for implantation of a fertilized egg.

Step 3: Recall the role of hCG. After a fertilized egg implants into the uterus, the developing placenta begins releasing hCG. This hormone signals the corpus luteum to continue producing progesterone to prevent menstruation and support the early pregnancy.

Step 4: Connect the information. The presence of hCG indeed helps to maintain the corpus luteum, which is crucial in the early stages of pregnancy until the placenta can fully take over hormone production.

Step 5: Answer the question. Based on the information, the statement 'The corpus luteum is retained upon implantation due to the presence of the hormone human chorionic gonadotropin (hCG)' is true.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Corpus Luteum

The corpus luteum is a temporary endocrine structure formed from the ovarian follicle after ovulation. It produces hormones, primarily progesterone, which are crucial for maintaining the uterine lining and supporting early pregnancy. If pregnancy occurs, the corpus luteum is retained; if not, it degenerates.

Human Chorionic Gonadotropin (hCG)

Human chorionic gonadotropin (hCG) is a hormone produced by the placenta shortly after implantation. Its primary role is to signal the corpus luteum to continue producing progesterone, which is essential for sustaining the pregnancy in its early stages. hCG is also the hormone detected in pregnancy tests.

Implantation

Implantation is the process by which a fertilized egg attaches itself to the uterine lining. This event is critical for establishing a pregnancy, as it allows for the exchange of nutrients and waste between the mother and the developing embryo. Successful implantation triggers hormonal changes, including the production of hCG.

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Textbook Question

Which of the following statements regarding animal development is/are correct? Select True or False for each statement.

T/FThe neural tube forms after organogenesis is complete

T/FThe blastocyst is formed during cleavage

T/FDuring cleavage, the zygote divides rapidly without growth, forming a mass of cells

T/FAnimals have two germ layers

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Textbook Question

Which of the following is properly paired?

a. Seminiferous tubule — Cervix

b. Vas deferens — Oviduct

c. Corpus luteum —Sertoli cell

d. Scrotum — Clitoris

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Textbook Question

A sperm cell follows which path?

a. Seminiferous tubules, epididymis, vas deferens, urethra

b. Urethra, vas deferens, seminiferous tubules, epididymis

c. Seminiferous tubules, vas deferens, epididymis, urethra

d. Epididymis, seminiferous tubules, vas deferens, urethra

e. Epididymis, vas deferens, seminiferous tubules, urethra

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Textbook Question

Peaks of LH and FSH production occur during

a. The menstrual flow phase of the uterine cycle

b. The beginning of the follicular phase of the ovarian cycle

c. The period just before ovulation

d. The secretory phase of the uterine cycle

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Textbook Question

An egg cell that is not fertilized follows which path?

a. Ovary, oviduct, uterus, cervix

b. Ovary, uterus, oviduct, cervix

c. Oviduct, ovary, cervix, uterus

d. Oviduct, ovary, uterus, cervix

e. Ovary, oviduct, cervix, uterus

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Textbook Question

During human gestation, rudiments of all organs develop

a. In the first trimester

b. In the second trimester

c. In the third trimester

d. During the blastocyst stage

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Textbook Question

Summarize the experimental evidence that Daphnia require three cues to trigger sexual reproduction. Discuss what these cues indicate about the environment.

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Textbook Question

Which of the following is mismatched?

a. Urethra: sperm passage

b. Testes: hormone production

c. Vas deferens: semen production

d. Seminiferous tubules: sperm production

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