Chapter 36, Problem 17A

Summary Introduction

Introduction:

The Sequence of development is the process through which a baby is developed and finally takes birth. Early development is the first week of the human development period. Many developmental changes occur at this period as the zygote travels through the oviduct.

Answer to Problem 17A

Correct answer:

The correct answer is option (B) estrogen and progesterone.

Explanation of Solution

Explanation/justification for the correct answer:

Option (B) estrogen and progesterone. Two steroid hormones that is estrogen and progesterone are formed by the placenta and it also develops many protein hormones including human chorionic gonadotropin, placental lactogen, placental relaxin, and kisspeptin. So, this is the correct option.

Explanation for incorrect answer: 

Option (A) human chorionic gonadotrophin. Human chorionic gonadotrophin is produced by the cell which eventually goes to the placenta but the placenta does not produce it directly. So, this is an incorrect option.

Option (C) oxytocin. The placenta produces estrogen and progesterone. It does not produce oxytocin. So, this is an incorrect answer.

Option (D) endometrial birth hormone. The placenta produces estrogen and progesterone. It does not produce endometrial birth hormones. So, this is an incorrect option.