Difference between Amnion And Allantois: Overview, Functions

What Is the Amnion?

The amnion is a very thin membrane covering the embryo. It forms a cavity filled with amniotic fluid. This fluid performs many vital functions, such as cushioning against shocks to the embryo and providing constant temperature conditions.

What Is the Allantois?

The allantois is a sac-like, routinely developed structure from the embryonic gut. It contributes to a vital part of the waste management system and gas exchange in the early period of development. The allantois contributes to the umbilical cord.

Developmental Origin

The developmental origin of amnion and allantois is discussed below:

Amnion Development

• The amnion originates a few days after fertilisation.

• It covers and encapsulates the embryo from all sides.

• Develops early in embryogenesis.

Allantois Development

• Develops during gastrulation.

• Arises as an outgrowth of the embryonic gut.

• Appears slightly later than amnion.

Differences Between Amnion And Allantois

Key difference between amnion and allantois is discussed in the table below:

Functional Significance

The details are given below:

Amnion

• Mechanical protection

• Prevents dehydration

• Allows free movement of embryo

Allantois

• Temporary waste storage

• Helps in respiratory exchange

• Structural contribution to umbilical cord

Amnion vs Allantois NEET MCQs (With Answers & Explanations)

Important questions asked in NEET from this topic are:

• Developmental origin of allantois and amnion

• Amnion vs Allantois

Practice Questions for NEET

Q1. Corpus luteum secretes a hormone called

1. Prolactin

2. Progesterone

3. Aldosterone

4. Testosterone

Correct answer: (2) Progesterone.

Explanation:

The hormone estrogen is released into the bloodstream by follicular cells, which function as endocrine cells. Conical, yellowish cells called corpus luteum, which degenerate into corpus albicans, are another component of the ovary's cortex.
Progesterone, estrogen, and relaxin are secreted by the corpus luteum, which also serves as an endocrine cell. The Corpus luteum functions as endocrine cells and secretes progesterone, estradiol, and relaxin.

Hence, the correct answer is the option (2) Progesterone.

Q2. Which of the following is primary sex organs in females?

1. Uterus

2. Vagina

3. Ovary

4. Mammary glands

Correct answer: (3) Ovary

Explanation:

The female reproductive system consists of a pair of ovaries along with a pair of oviducts, uterus, cervix, vagina, and external genitalia located in the pelvic region. These parts of the system along with a pair of mammary glands are integrated structurally and functionally to support the processes of ovulation, fertilization, pregnancy, birth, and child care.

Ovaries are the primary female sex organs that produce the female gamete (ovum) and several steroid hormones (ovarian hormones). The ovaries are located on each side of the lower abdomen.

Hence, the correct answer is option (3) Ovary.

Q3. Select correct option for female primary sex organ

1. Ovary are organs that produce the female gamete (ovum) and several ovarian hormones (ovarian hormones)

2. Ovary are organs that produce female gamete (ovum) only

3. Ovary are organs that produce steroidal hormones only

4. None of these

Correct answer: 1) ovaries are organs that produce the female gamete (ovum) and several ovarian hormones (ovarian hormones)

Explanation:

Ovaries are the primary female sex The ovaries are organs that produce the female gamete (ovum) and several steroid hormones (ovarian hormones), i.e., estrogen and progesterone. The Corpus luteum in the ovaries functions as endocrine cells and secretes progesterone, estradiol and relaxin.

Hence, the correct answer is option 1) ovaries are organs that produce the female gamete (ovum) and several ovarian hormones (ovarian hormones)

Also Read:

• MCQs on Female Reproductive System

• Implantation

• Male Reproductive System