Ib BIOLOGY

Sunday, October 23, 2005

Lesson six: Reproduction (structures

Reproduction
*bow chicka wowow*
Hey, fish gotta spawn too!


Why learn about the Reproductive cycle?
Understanding Hormones
What is going on with my body?
You might be a parent some day
And have to understand things like tearing
Learn about interesting anomalies…


What is going on here?
Hermaphrodites.... They have both Male and female gonads.

Protec yo Neck
Turner's syndrome. These females have only one X chromosome (XO). Characteristics: Short stature, webed neck, stubby hands, loss of ovarian function, heart disease, increased kidney failure.

The Ys of Males
Individuals with Klinefelter Syndrome have the genetic make up XXY. Characteristics: underdevelopment of the testicles, a condition called hypogonadism, which usually leads to infertility, a taller-than-average height and a feminine body build, slightly lower IQ.

If these are wrong…
…then what’s right?
What are some characteristics of male development?
Male: facial hair, chest hair, larger voice box, more muscle
Female: enlarged breasts, rounder hips (birthin hips)

the Male System
Animation

Female
Animation

Romeo-stasis ;)
FSH and LH are found in the male system as well!
FSH promotes spermatogenesis
LH is called ICSH (interstitial cell stimulating hormone), --> stimulates testosterone secretion
Leydig cells found between the seminiferous tubules produce testosterone, which promotes secondary sexual characteristics, growth and activity of the male reproductive organs.

Don’t forget Juliet
Pituitary releases FSH, which causes a ripening of the follicle.
Follicle releases estrogen. Estrogen increases Endometrium thickness, and inhibits FSH., but stimulates LH production
LH stimulates ovulation and development of corpus leutium.
The Corupus lutium produces progesterone which keeps endometrium intact and inhibits FSH and LH
No fertilization? The Corpus Lutium degenerates and FSH is produced.


Look over pp104-106 Kindey stuff
SB2 pp228-230, 234-235

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