Biology Notes > The British International School, Ho Chi Minh Biology Notes > Human Physiology Notes

Human Physiology Reproduction Notes

This is a sample of our (approximately) 6 page long Human Physiology Reproduction notes, which we sell as part of the Human Physiology Notes collection, a Grade 7 package written at The British International School, Ho Chi Minh in 2013 that contains (approximately) 32 pages of notes across 6 different documents.

Learn more about our Human Physiology Notes

The original file is a 'Word (Docx)' whilst this sample is a 'PDF' representation of said file. This means that the formatting here may have errors. The original document you'll receive on purchase should have more polished formatting.

Human Physiology Reproduction Revision

The following is a plain text extract of the PDF sample above, taken from our Human Physiology Notes. This text version has had its formatting removed so pay attention to its contents alone rather than its presentation. The version you download will have its original formatting intact and so will be much prettier to look at.

HUMAN PHYSIOLOGY Reproduction

6.6.1 Draw and label diagrams of the adult male and female reproductive systems.(1) Gametes are haploid sex cells that fuse through fertilization in sexual reproduction to form a diploid zygote

Male reproductive system:

Spermatogenesis in the testis

Maturation in the epididymis

Carried along the vas deferens

Ejaculation through the penis, via the urethra

Female reproductive system: Acidic to kill bacteria

Eggs develop in follicles (FSH trigger development of follicle)

6.6.2 Outline the role of hormones in the menstrual cycle, including FSH (follicle stimulating hormone), LH (luteinizing hormone), oestrogen and progesterone.(2). Cycle controlled by hormones (endocrine system) :

Brain: FSH and LH

Ovary : oestrogen and progesterone

1.

FSH is secreted by the pituitary gland and its levels start to rise. This stimulates the follicle to develop and the follicle cells to secret estrogen.

2.

Estrogen then causes the follicle cells to make more FSH receptors so that these can respond more strongly to the FSH.

3.

This is positive feedback and causes the estrogen levels to increase and stimulate the thickening of the endometrium (uterus lining).

4.

Estrogen levels increase to a peak and by doing so it stimulates LH secretion from the pituitary gland.

5.

LH then increases to its peak and causes ovulation (release of egg from the follicle).

6.

LH then stimulates the follicle cells to secrete less estrogen and more progesterone. Once ovulation has occurred, LH stimulated the follicle to develop into the corpus luteum.

7.

The corpus luteum then starts to secrete high amounts of progesterone. This prepares the uterine lining for an embryo.

8.

The high levels of estrogen and progesterone then start to inhibit FSH and LH.

9.

If no embryo develops the levels of estrogen and progesterone fall. This stimulates menstruation (break down of the uterine lining). When the levels of these two hormones are low enough FSH and LH start to be secreted again.

10. FSH levels rise once again and a new menstrual cycle begins.

Pituitary Hormones (Follicle Stimulating hormone - FSH) :

Stimulates follicle development (oocytes)

Stimulates oestrogen secretion (by developing follicle)

Ovarian Hormones (Oestrogen) :

Stimulates endometrium development (lining of the uterus)

First half of the cycle : positive feedback to FSH through increased sensitivity of the follicle cells

Second half of cycle : (high oestrogen) Negative feedback on FSH and LH.

Pituitary Hormones (Luteinising Hormone - LH):

Matures oocyte and causes ovulation

Causes development of corpus luteum

Causes secretion of progesterone

Ovarian Hormones (Progesterone) :

Maintains the lining of the endometrium - thickens and prepares for implantation

Negative feedback on FSH and LH

****************************End Of Sample*****************************

Buy the full version of these notes or essay plans and more in our Human Physiology Notes.