Quiz 1 of 0
Placenta and its classification Formation of foetal membranes in mammals and birds
vaibhavpatel1028@gmail.com September 30, 2024
Multiple Choice Questions (MCQs)
- What is the primary function of the amnion?
- A) Nutrient exchange
- B) Protection and cushioning
- C) Waste storage
- D) Gas exchange
Answer: B) Protection and cushioning
- Which fetal membrane contributes to the formation of the placenta in mammals?
- A) Amnion
- B) Yolk sac
- C) Allantois
- D) Chorion
Answer: D) Chorion
- What type of placenta has maternal blood in direct contact with chorionic tissue?
- A) Epitheliochorial
- B) Syndesmochorial
- C) Endotheliochorial
- D) Hemochorial
Answer: D) Hemochorial
- Which germ layer forms the skin and nervous system?
- A) Mesoderm
- B) Endoderm
- C) Ectoderm
- D) Trophoblast
Answer: C) Ectoderm
- The yolk sac provides early nourishment to the embryo primarily in which type of animal?
- A) Mammals
- B) Birds
- C) Reptiles
- D) Amphibians
Answer: B) Birds
- What type of implantation is characterized by villi distributed over the entire surface?
- A) Cotyledonary
- B) Discoidal
- C) Diffuse
- D) Zonary
Answer: C) Diffuse
- The allantois is primarily involved in which of the following functions?
- A) Nutrient absorption
- B) Gas exchange and waste storage
- C) Hormone production
- D) Temperature regulation
Answer: B) Gas exchange and waste storage
- Which type of placenta has maternal epithelium absent?
- A) Epitheliochorial
- B) Syndesmochorial
- C) Endotheliochorial
- D) Hemochorial
Answer: B) Syndesmochorial
- The mesoderm gives rise to which of the following systems?
- A) Nervous system
- B) Musculoskeletal system
- C) Digestive system
- D) Integumentary system
Answer: B) Musculoskeletal system
- Which layer is responsible for forming internal organs like the gut and lungs?
- A) Ectoderm
- B) Mesoderm
- C) Endoderm
- D) Trophoblast
Answer: C) Endoderm
True/False Statements
- The amnion is involved in nutrient exchange between mother and fetus.
Answer: False (The amnion provides protection.) - The chorion is the outermost fetal membrane.
Answer: True - Hemochorial placenta has all six tissue layers intact.
Answer: False (Hemochorial placenta has maternal blood in direct contact with chorion.) - Ectoderm gives rise to the epidermis and nervous tissue.
Answer: True - The allantois is primarily responsible for providing nutrients to the embryo.
Answer: False (It is involved in gas exchange and waste storage.) - Cotyledonary placenta has villi grouped into specific areas called caruncles.
Answer: True - Mesolecithal eggs contain minimal yolk for development.
Answer: False (Mesolecithal eggs have moderate yolk.) - Diffuse placenta has a band-like zone of villi for attachment.
Answer: False (Diffuse placenta has villi distributed over the entire surface.) - The yolk sac is a significant source of nutrients in mammals during early development.
Answer: False (It is more significant in birds.) - Syndesmochorial placenta lacks maternal epithelium but retains other layers.
Answer: True
Fill in the Blanks
- The __________ is a fluid-filled sac that provides cushioning around the embryo.
Answer: amnion - The __________ contributes to gas exchange and forms part of the umbilical cord.
Answer: allantois - The outermost fetal membrane that surrounds all others is called the __________.
Answer: chorion - The __________ layer forms skin, hair, and nervous tissue.
Answer: ectoderm - The __________ is responsible for forming muscles, bones, and the circulatory system.
Answer: mesoderm - The __________ contains yolk that serves as a nutrient source in birds.
Answer: yolk sac - In mammals, the placenta facilitates __________ exchange between mother and fetus.
Answer: nutrient and gas - The __________ placenta has maternal blood in direct contact with chorionic tissue.
Answer: hemochorial - __________ implantation involves significant remodeling of maternal tissues.
Answer: Decidual - The __________ layer forms internal organs such as the gut and lungs.
Answer: endoderm