Chapter 4 Self-test questions

The principal factor affecting the timing of a girl's first period (menarche) is…

Reaching the age of about 11.

Switching on growth hormone production.

Achieving a weight of about 47 kg.

Switching off luteinising hormone production.

The effects of hypothalamic kisspeptin neurons maturing at puberty in both boys and girls is…

Triggering the urge to kiss.

Switching off gonadotropin releasing hormone (GnRH) production.

Switching GnRH production to a constant level rather than episodic.

Making GnRH production episodic instead of constant.

Human ovulation is an example of…

Continuous cycling spontaneous ovulation.

Seasonal spontaneous ovulation.

Male effect induced ovulation.

Reflex induced ovulation.

Ovulation in continuous cyclers such as women, is triggered by…

A sharp rise in progesterone levels.

A sharp drop in oestrogen levels.

A sharp rise in LH levels.

A sharp drop in FSH levels.

The pineal gland hormone that determines the timing of ovulation in animals that reproduce seasonally, like sheep and deer is…

Kisspeptin.

Melatonin.

Melanocyte stimulating hormone (MSH).

Progesterone.

Ovulation can be induced in a whole flock of sheep by introducing a billy goat into the flock. This is an example of…

Continuous cycling spontaneous ovulation.

Seasonal spontaneous ovulation.

Male effect induced ovulation.

Reflex induced ovulation.

Which of the following is true of human sperm production?

It occurs seasonally in spring and summer.

It only occurs as a result of sexual intercourse.

It occurs until a man reaches the age of about 50.

It occurs throughout a man's life.

How long after sex do sperm survive in a woman's reproductive tract?

2–4 seconds.

2–4 minutes.

2–4 hours.

2–4 days.

The combined oral contraceptive pill for women contains steroids with the actions of…

Oestrogen and progesterone.

Oestrogen and testosterone.

Progesterone and testosterone.

Progesterone and GnRH.

The key hormone for triggering childbirth in a pregnant woman is…

Corticotropin releasing hormone from the hypothalamus.

Corticotropin releasing hormone from the placenta.

Progesterone from the ovaries.

Progesterone from the placenta.

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