4.2 reproduction

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Welcome everyone 

 Think about...

• Book (laptop) + notebook, pen on the table. Bag on the floor.
• Sit in your own place.
• 5 minutes.

schedule 

• Repetition                                 
• Explanation 4.2               
• video                                               
• Doing assignments                
• Closing                                        

Learning goals 4.2

• 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

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 spongy erectile tissue relaxes.

-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

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 4.2: assignments 1 until 8

finished? read paragraph 4.3