Hormones, part 1

• Biologie
• Middelbare school
• vwo
• Leerjaar 4

Reproduction

Hormones part 1

Learning objectives

• Describe what hormones are and how they are transported through the body
• Describe the hormonal system in males related to reproduction
• Describe the effect and importance of negative feedback
• Describe the main elements of the menstrual cycle

The uterus

1. 16
2. 9
3. 7
4. 3

The fallopian tube/oviduct

1. 10
2. 5
3. 1
4. 13

Entrance for sperm cells and exit for baby:

1. 13
2. 10
3. 11
4. 4

Storage of sperm cells:

1. 9
2. 11
3. 5
4. 8

Urethra:

1. 15
2. 10
3. 7
4. 8

Transports semen out of the body:

1. 15
2. 10
3. 7
4. 8

What do you know about hormones?

Hormones

Chemical messengers that are secreted by hormone glands and transported with the blood. Therefore each hormone ends up everywhere in the body.

They connect to receptors on the cells of the target organ(s) and trigger a response.

Hormone gland

Blood

Target organ

Produce and secrete the hormone. Can be far from target organ. They always produce small amounts.

Blood travels throughout the entire body, therefore the hormones will end up everywhere.

The cells of the target organ have receptors the hormones can bind to and trigger a response

Example:

Pancreas produces insuline

Transported everywhere in the body

Mainly liver and muscle cells to stimulate the uptake of glucose 

How come organs don't respond to all hormones that pass by with the blood?

Milou: hormones are transported through the blood
Rico: hormones pass on signals, because they connect to the cell membrane of certain cells
Who is right?

1. Milou
2. Rico
3. Both
4. Neither

Male hormone cycle

Negative feedback

The hormone that is produced inhibits (decreases) its own production.

This creates a balance in hormone levels.

Testosterone inhibits the hypothalamus
and pituitary gland which slows down its
own production

Which hormone(s) is/are produced in this organ?

1. progesterone
2. testosterone
3. FSH and LH
4. FSH

What do FSH and LH stimulate in men?

1. FSH: spermatogenesis, LH: testosterone production
2. FSH: secondary sexual characteristics, LH: testosterone production
3. FSH: testosterone production, LH: spermatogenesis
4. FSH: secondary sexual characteristics, LH: spermatogenesis

The testosterone level of a particular male is labeled R. Because of an inflammation one of the sperm ducts is closed off. What happens with R?

1. Increases
2. Decreases
3. Stays equal

menstruation

ovulation

ripening ovum

Homework

• Complete and hand in worksheet male reproductive hormones