Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

28. Human Development

Introduction to Human Development

Anatomy & Physiology

28. Human Development

Introduction to Human Development

Previous problemNext problem

Problem 6

Textbook Question

The pre-embryo develops into a multicellular complex known as a
(a) Blastocyst
(b) Trophoblast
(c) Lacuna
(d) Blastomere

Verified step by step guidance

Understand the developmental stages of the pre-embryo: After fertilization, the zygote undergoes cleavage, forming smaller cells called blastomeres.

Learn about the blastocyst stage: As cleavage continues, the pre-embryo forms a hollow structure known as the blastocyst, which consists of an inner cell mass and an outer layer called the trophoblast.

Differentiate between the terms: The trophoblast is the outer layer of the blastocyst that contributes to the formation of the placenta, while lacuna refers to spaces that form in the trophoblast during implantation.

Focus on the correct term: The multicellular complex formed after cleavage and before implantation is specifically referred to as the blastocyst.

Review the options provided: Match the correct term (blastocyst) to the description of the multicellular complex formed during early development.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Play a video:

Was this helpful?

Key Concepts

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

Blastocyst

The blastocyst is a structure formed in the early development of mammals, typically around five to six days post-fertilization. It consists of an inner cell mass that will eventually develop into the embryo and an outer layer called the trophoblast, which will contribute to the placenta. Understanding the blastocyst is crucial for comprehending early embryonic development and implantation.

Trophoblast

The trophoblast is the outer layer of cells in the blastocyst that plays a vital role in implantation into the uterine wall and in forming the placenta. It facilitates nutrient exchange between the mother and the developing embryo. Recognizing the function of the trophoblast is essential for understanding how embryos establish a connection with maternal tissues.

Blastomere

Blastomeres are the individual cells that result from the cleavage of the fertilized egg during the early stages of embryonic development. As the zygote divides, these cells continue to divide and eventually form the blastocyst. Understanding blastomeres is important for grasping the initial stages of cell division and differentiation in embryogenesis.