Problem 12 - Clinical Chemistry

Question

Which hormone is responsible for an increase in body temperature at the time of ovulation? a. Progesterone b. Estrogen c. LH d. FSH e. Estradiol

Step-by-Step Solution

Answer

a. Progesterone.

Step 1 - Understand the Question

The question asks which hormone is responsible for increasing body temperature during ovulation. This requires knowledge of the menstrual cycle and the hormonal changes that accompany it.

Step 2 - Review Hormones and Their Functions

Identify the functions of the hormones listed:- Progesterone: A hormone released after ovulation that prepares the uterus for pregnancy and can increase body temperature.- Estrogen: A hormone that regulates the menstrual cycle and prepares the uterine lining, primarily responsible for the thickening of the endometrium.- LH (Luteinizing Hormone): Triggers ovulation.- FSH (Follicle-Stimulating Hormone): Stimulates the growth of ovarian follicles before ovulation.- Estradiol: A form of estrogen mainly involved in the regulation of the menstrual cycle.

Step 3 - Identify the Key Hormone

Since an increase in body temperature is specific to the luteal phase (post-ovulation) due to the action of progesterone, identify Progesterone as the hormone responsible.

Step 4 - Choose the Correct Answer

From the given options, a. Progesterone is the correct answer.

Key Concepts

menstrual cycle

The menstrual cycle is a natural process that prepares the female body for pregnancy. It is typically around 28 days long but can vary among individuals. The cycle is divided into four main phases:

• Menstrual phase: This is when the shedding of the uterine lining occurs, resulting in menstruation.
• Follicular phase: During this phase, the hormone FSH stimulates the growth of ovarian follicles, one of which will mature into an egg.
• Ovulation: This is triggered by a surge in LH, resulting in the release of the egg from the ovary.
• Luteal phase: After ovulation, the ruptured follicle transforms into the corpus luteum, which produces progesterone to prepare the uterus for pregnancy.

Understanding these phases and the hormonal changes that drive them is key to grasping menstrual cycle-related questions.

progesterone

Progesterone is a crucial hormone in the female reproductive system. It plays several important roles:

• After ovulation, progesterone levels rise, leading to the thickening of the uterine lining.
• It helps maintain the early stages of pregnancy by stabilizing the lining.
• It is produced by the corpus luteum in the second half of the menstrual cycle.
• Progesterone also causes a slight increase in body temperature, which can be tracked to identify ovulation.

This hormone's functions are vital for understanding reproductive health and solving related questions in textbooks.

body temperature regulation

Body temperature is influenced by various factors, including hormonal changes during the menstrual cycle. Here's how it works:

• During the follicular phase, basal body temperature remains relatively low.
• Ovulation leads to the release of progesterone by the corpus luteum.
• Progesterone causes a slight increase in basal body temperature, usually by about 0.5°F (0.3°C).
• This temperature rise persists throughout the luteal phase until menstruation begins, marking another cycle's start.

Tracking basal body temperature can help identify ovulation and is useful for both conception and contraception planning.