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Flashcards in Reproductive phsiology Deck (18)
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1

2 functions of male reproductive system

Initiate and sustain male phenotype
Production of mature sperm

2

2 things to initiate erection

Sexual thoughts in brain-> penis via spine
Tactile stimulus

3

What initiates erection

Increased parasympathetic stimulation to smooth muscle of pudendal artery

4

Effect of increased parasympathetic activity to pudendal artery

Increased activation of nitric oxide synthase which increases NO. This increases production of cGMP which dilates arterial smooth muscle

5

Effect of dilated pudendal artery

Increases blood flow to corpus cavernosum and compresses dorsal vein thus restricting outflow of blood

6

What protects urethra from increased pressure in an erection

Corpus spongiosum that is less turgid

7

What deactivates cGMP normally

Phosphodiesterease enzyme

8

How dos viagra work

Viagra inhibits the phosphodiesterase which would normally reduce cGMP

9

Most important organ involved in sexual reproduction

Brain

10

Pathways in brain involved in sexual reproduction

Mesolimbic dopaminergic pathway- reward and pleasure
Nigrostriatal tract- control and movements
Neuroendocrine- regulating fertility

11

Role of epididymis

Sperm kept here before ejaculation

12

Role of vas deferens

From epididymis to urethra and is where excrements from seminal vesicle and prostate go

13

What stimulates leydig cells

LH

14

What stimulates sertoli cells

FSH

15

What do leydig cells produce

Testosterone
- found outside seminiferous tubules

16

Effects of testosterone

Growth
Negative feedback of FSH and LHand GnRH
Spermatogenesis

17

Role of sertoli cells

Inhibin negative feedback on APG
Nutritional and hormonal support for spermatogenesis

18

Proecess of spermatogenesis

Spermatagonia->1 spermatocyte (mitosis)->2 spermatocyte (meiosis 1)-> spermatid (meiosis 2)-> spermatocytes(development)