4.1/4.2 reproduction

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Welcome everyone 

 Think about...

• Take off your coat, hat/cap off.
• Mobile in the phone bag (on silent).
• Book (laptop) + notebook, pen on the table. Bag on the floor.
• Sit in your own place.
• You can eat and drink in the canteen.
• 5 minutes.

schedule 

• Repetition                                 10 min.
• Explanation 4.1/4.2               10 min.
• video                                            5 min.   
• Doing assignments              15 min      
• Closing                                        5 min. 

Learning goals 4.1 +4.2

• What are the two main types of reproduction and what are advantages and disadvantages of these types of reproduction?
• Which organs make up the male reproductive system?
  
• Where do male sex cells form and develop?
  
• Which organs make up the female reproductive system?
  
• Where do female sex cells form and develop?

Reproduction

• Reproduction (or procreation, breeding) = the biological process by which new individual organisms ("offspring") are produced from their "parents"
• Without reproduction, there would not be as much life possible as we have now

Talking point 4.1

Discuss with another student what could happen if humans could reproduce asexually? What would be an advantage and what would be a disadvantage?

Reproduction

Two types of reproduction:

1. Sexual reproduction: fusion of gamets required                            - Lots of variety         
2. Asexual reproduction: no gamets needed                                         - No variety 

Sperm or semen?

-Testes produce sperm cells.

-Epididymes store sperm cells-->release during orgasm.

-seminal vesicles+ prostate add fluid and nutrients--> activate sperm. Fluid=semen. 

Erections

-Blood vessel to erectile tissue relaxes (muscle).

-Blood fills erectile tissue-->penis becomes erect (hard).

-Erections can happen any time, uncontrolled. Especially during puberty.

Ejaculation

-Ejaculation is male orgasm.

-Amount of semen: average tea spoon of semen.

-Sperm cell 3 parts: head with nucleus, midpiece with energy, tail for 'swimming'.

Female reproductive system

• In the ovary eggs are ripen in a follicle.
  
• After ovulation (eruption of follicle)                                                    an eggs goes into the oviduct.

• Possible fertilaztion happens in  

the fallopian tube (oviduct).

• No fertilization? Menstruation starts.  

Talking point 4.2

Bacteria that enter through the urethra and travel into the bladder can cause a bladder infection. Discuss with a student why bladder infections are more common in females than in males.

Make assignments

paragraph 4.1: 1 assignments 

paragraph 4.2: assignments 1 until 7 

finished? read paragraph 4.3